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| Symbol | Description | Subject | Level | Frequency | Aliases | LaTeX | Unicode | Related | Example | Common fields |
|---|---|---|---|---|---|---|---|---|---|---|
| = denotes assignment in programming operators. | Programming Operators | Intermediate | Frequent | Assignment 赋值 | = | U+003D | — | x = 1 | Software, data, systems operations, education | |
| == denotes equality comparison in programming operators. | Programming Operators | Intermediate | Frequent | Equality comparison 相等比较 | == | U+003D + U+003D | — | x == y | Software, data, systems operations, education | |
| === denotes strict equality in programming operators. | Programming Operators | Intermediate | Frequent | Strict equality 严格相等 | === | U+003D + U+003D + U+003D | — | x === y | Software, data, systems operations, education | |
| != denotes inequality comparison in programming operators. | Programming Operators | Intermediate | Frequent | Inequality comparison 不等比较 | != | U+0021 + U+003D | — | x != y | Software, data, systems operations, education | |
| !== denotes strict inequality in programming operators. | Programming Operators | Intermediate | Frequent | Strict inequality 严格不等 | !== | U+0021 + U+003D + U+003D | — | x !== y | Software, data, systems operations, education | |
| + denotes addition or concatenation in programming operators. | Programming Operators | Intermediate | Frequent | Addition or concatenation 加法或拼接 | + | U+002B | — | a + b | Software, data, systems operations, education | |
| - denotes subtraction or negation in programming operators. | Programming Operators | Intermediate | Frequent | Subtraction or negation 减法或负号 | - | U+002D | — | a - b | Software, data, systems operations, education | |
| * denotes multiplication or wildcard in programming operators. | Programming Operators | Intermediate | Frequent | Multiplication or wildcard 乘法或通配 | * | U+002A | — | a * b | Software, data, systems operations, education | |
| / denotes division or path separator in programming operators. | Programming Operators | Intermediate | Frequent | Division or path separator 除法或路径分隔 | / | U+002F | — | a / b | Software, data, systems operations, education | |
| % denotes remainder in programming operators. | Programming Operators | Intermediate | Frequent | Remainder 取模 | \% | U+0025 | — | a % b | Software, data, systems operations, education | |
| ** denotes exponentiation in programming operators. | Programming Operators | Intermediate | Frequent | Exponentiation 幂运算 | ** | U+002A + U+002A | — | a ** b | Software, data, systems operations, education | |
| ++ denotes increment in programming operators. | Programming Operators | Intermediate | Frequent | Increment 自增 | ++ | U+002B + U+002B | — | i++ | Software, data, systems operations, education | |
| -- denotes decrement in programming operators. | Programming Operators | Intermediate | Frequent | Decrement 自减 | -- | U+002D + U+002D | — | i-- | Software, data, systems operations, education | |
| && denotes logical and in programming operators. | Programming Operators | Intermediate | Frequent | Logical AND 逻辑与 | \&\& | U+0026 + U+0026 | — | a && b | Software, data, systems operations, education | |
| || denotes logical or in programming operators. | Programming Operators | Intermediate | Frequent | Logical OR 逻辑或 | || | U+007C + U+007C | — | a || b | Software, data, systems operations, education | |
| ! denotes logical not in programming operators. | Programming Operators | Intermediate | Frequent | Logical NOT 逻辑非 | ! | U+0021 | — | !value | Software, data, systems operations, education | |
| ?? denotes nullish coalescing in programming operators. | Programming Operators | Intermediate | Frequent | Nullish coalescing 空值合并 | ?? | U+003F + U+003F | — | a ?? b | Software, data, systems operations, education | |
| ?. denotes optional chaining in programming operators. | Programming Operators | Intermediate | Frequent | Optional chaining 可选链 | ?. | U+003F + U+002E | — | obj?.key | Software, data, systems operations, education | |
| ?: denotes conditional operator in programming operators. | Programming Operators | Intermediate | Frequent | Conditional operator 条件运算 | ?: | U+003F + U+003A | — | ok ? a : b | Software, data, systems operations, education | |
| => denotes arrow function in programming operators. | Programming Operators | Intermediate | Frequent | Arrow function 箭头函数 | => | U+003D + U+003E | — | x => x * 2 | Software, data, systems operations, education | |
| < denotes less than in programming operators. | Programming Operators | Intermediate | Frequent | Less than 小于 | < | U+003C | — | a < b | Software, data, systems operations, education | |
| > denotes greater than in programming operators. | Programming Operators | Intermediate | Frequent | Greater than 大于 | > | U+003E | — | a > b | Software, data, systems operations, education | |
| <= denotes less than or equal in programming operators. | Programming Operators | Intermediate | Frequent | Less than or equal 小于等于 | <= | U+003C + U+003D | — | a <= b | Software, data, systems operations, education | |
| >= denotes greater than or equal in programming operators. | Programming Operators | Intermediate | Frequent | Greater than or equal 大于等于 | >= | U+003E + U+003D | — | a >= b | Software, data, systems operations, education | |
| & denotes bitwise and in data & logic. | Data & Logic | Intermediate | Frequent | Bitwise AND 按位与 | \& | U+0026 | — | a & b | Software, data, systems operations, education | |
| | denotes bitwise or in data & logic. | Data & Logic | Intermediate | Frequent | Bitwise OR 按位或 | | | U+007C | — | a | b | Software, data, systems operations, education | |
| ^ denotes bitwise xor in data & logic. | Data & Logic | Intermediate | Frequent | Bitwise XOR 按位异或 | \hat{} | U+005E | — | a ^ b | Software, data, systems operations, education | |
| ~ denotes bitwise not in data & logic. | Data & Logic | Intermediate | Frequent | Bitwise NOT 按位非 | \sim | U+007E | — | ~a | Software, data, systems operations, education | |
| << denotes left shift in data & logic. | Data & Logic | Intermediate | Frequent | Left shift 左移 | << | U+003C + U+003C | — | a << 1 | Software, data, systems operations, education | |
| >> denotes right shift in data & logic. | Data & Logic | Intermediate | Frequent | Right shift 右移 | >> | U+003E + U+003E | — | a >> 1 | Software, data, systems operations, education | |
| 0b denotes binary prefix in data & logic. | Data & Logic | Intermediate | Frequent | Binary prefix 二进制前缀 | 0b | U+0030 + U+0062 | — | 0b1010 | Software, data, systems operations, education | |
| 0x denotes hexadecimal prefix in data & logic. | Data & Logic | Intermediate | Frequent | Hexadecimal prefix 十六进制前缀 | 0x | U+0030 + U+0078 | — | 0xFF | Software, data, systems operations, education | |
| ∅ denotes empty set or null concept in data & logic. | Data & Logic | Intermediate | Frequent | Empty set or null concept 空集或空值概念 | \varnothing | U+2205 | — | ∅ | Software, data, systems operations, education | |
| ⊤ denotes true in data & logic. | Data & Logic | Intermediate | Frequent | True 真 | \top | U+22A4 | — | A = ⊤ | Software, data, systems operations, education | |
| ⊥ denotes false in data & logic. | Data & Logic | Intermediate | Frequent | False 假 | \bot | U+22A5 | — | A = ⊥ | Software, data, systems operations, education | |
| .* denotes any characters in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Any characters 任意字符重复 | .* | U+002E + U+002A | — | /^a.*z$/ | Software, data, systems operations, education | |
| ^ denotes start of line in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Start of line 行首 | ^ | U+005E | — | ^hello | Software, data, systems operations, education | |
| $ denotes end of line or prompt in regex & terminal. | Regex & Terminal | Intermediate | Frequent | End of line or prompt 行尾或提示符 | \$ | U+0024 | — | hello$ | Software, data, systems operations, education | |
| \b denotes word boundary in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Word boundary 单词边界 | \backslash b | U+005C + U+0062 | — | \bword\b | Software, data, systems operations, education | |
| \d denotes digit character in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Digit character 数字字符 | \backslash d | U+005C + U+0064 | — | \d+ | Software, data, systems operations, education | |
| \s denotes whitespace character in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Whitespace character 空白字符 | \backslash s | U+005C + U+0073 | — | \s+ | Software, data, systems operations, education | |
| [] denotes character class in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Character class 字符类 | [] | U+005B + U+005D | — | [a-z] | Software, data, systems operations, education | |
| () denotes capturing group in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Capturing group 捕获组 | () | U+0028 + U+0029 | — | (foo|bar) | Software, data, systems operations, education | |
| {} denotes quantifier range in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Quantifier range 量词范围 | \{\} | U+007B + U+007D | — | a{2,4} | Software, data, systems operations, education | |
| | denotes regex alternation in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Regex alternation 正则分支 | | | U+007C | — | cat|dog | Software, data, systems operations, education | |
| > denotes command prompt in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Command prompt 命令提示符 | > | U+003E | — | > command | Software, data, systems operations, education | |
| # denotes comment or root prompt in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Comment or root prompt 注释或超级用户提示符 | \# | U+0023 | — | # comment | Software, data, systems operations, education | |
| | denotes pipe in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Pipe 管道 | | | U+007C | — | cmd | sort | Software, data, systems operations, education | |
| > denotes output redirection in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Output redirection 输出重定向 | > | U+003E | — | cmd > file | Software, data, systems operations, education | |
| >> denotes append redirection in regex & terminal. | Regex & Terminal | Intermediate | Frequent | Append redirection 追加重定向 | >> | U+003E + U+003E | — | cmd >> file | Software, data, systems operations, education | |
| ● denotes flow start or end in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Flow start or end 流程开始或结束 | \bullet | U+25CF | — | ● Start | Software, data, systems operations, education | |
| ◇ denotes decision in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Decision 判断 | \diamond | U+25C7 | — | ◇ condition | Software, data, systems operations, education | |
| ▭ denotes process in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Process 处理步骤 | \Box | U+25AD | — | ▭ process | Software, data, systems operations, education | |
| → denotes control flow in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Control flow 控制流 | \rightarrow | U+2192 | — | A → B | Software, data, systems operations, education | |
| 1..* denotes one-to-many multiplicity in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | One-to-many multiplicity 一对多基数 | 1..* | U+0031 + U+002E + U+002E + U+002A | — | User 1..* Order | Software, data, systems operations, education | |
| 0..1 denotes optional multiplicity in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Optional multiplicity 可选基数 | 0..1 | U+0030 + U+002E + U+002E + U+0031 | — | 0..1 | Software, data, systems operations, education | |
| + denotes public visibility in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Public visibility 公共可见性 | + | U+002B | — | +method() | Software, data, systems operations, education | |
| - denotes private visibility in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Private visibility 私有可见性 | - | U+002D | — | -field | Software, data, systems operations, education | |
| # denotes protected visibility in flowcharts & uml. | Flowcharts & UML | Intermediate | Frequent | Protected visibility 受保护可见性 | \# | U+0023 | — | #member | Software, data, systems operations, education |
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A symbol may mean different things across disciplines and standards. Always interpret it with its subject, context, and cited sources.