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Description	Subject	Level	Frequency	Aliases	LaTeX	Unicode	Related	Example	Common fields
x denotes position in mechanics.	Mechanics	Intermediate	Frequent	Position 位置	`x`	`U+0078`	—	x(t)	Physics, engineering, research, education
s denotes displacement in mechanics.	Mechanics	Intermediate	Frequent	Displacement 位移	`s`	`U+0073`	—	s = vt	Physics, engineering, research, education
d denotes distance in mechanics.	Mechanics	Intermediate	Frequent	Distance 路程	`d`	`U+0064`	—	d = vt	Physics, engineering, research, education
t denotes time in mechanics.	Mechanics	Intermediate	Frequent	Time 时间	`t`	`U+0074`	—	v = Δx/Δt	Physics, engineering, research, education
m denotes mass in mechanics.	Mechanics	Intermediate	Frequent	Mass 质量	`m`	`U+006D`	—	F = ma	Physics, engineering, research, education
v denotes velocity in mechanics.	Mechanics	Intermediate	Frequent	Velocity 速度	`v`	`U+0076`	—	v = dx/dt	Physics, engineering, research, education
a denotes acceleration in mechanics.	Mechanics	Intermediate	Frequent	Acceleration 加速度	`a`	`U+0061`	—	a = dv/dt	Physics, engineering, research, education
F denotes force in mechanics.	Mechanics	Intermediate	Frequent	Force 力	`F`	`U+0046`	—	F = ma	Physics, engineering, research, education
p denotes momentum in mechanics.	Mechanics	Intermediate	Frequent	Momentum 动量	`p`	`U+0070`	—	p = mv	Physics, engineering, research, education
J denotes impulse in mechanics.	Mechanics	Intermediate	Frequent	Impulse 冲量	`J`	`U+004A`	—	J = Δp	Physics, engineering, research, education
W denotes work in mechanics.	Mechanics	Intermediate	Frequent	Work 功	`W`	`U+0057`	—	W = F·s	Physics, engineering, research, education
P denotes power in mechanics.	Mechanics	Intermediate	Frequent	Power 功率	`P`	`U+0050`	—	P = dW/dt	Physics, engineering, research, education
Eₖ denotes kinetic energy in mechanics.	Mechanics	Intermediate	Frequent	Kinetic energy 动能	`E_k`	`U+0045 + U+2096`	—	Eₖ = mv²/2	Physics, engineering, research, education
Eₚ denotes potential energy in mechanics.	Mechanics	Intermediate	Frequent	Potential energy 势能	`E_p`	`U+0045 + U+209A`	—	Eₚ = mgh	Physics, engineering, research, education
L denotes angular momentum in mechanics.	Mechanics	Intermediate	Frequent	Angular momentum 角动量	`L`	`U+004C`	—	L = r × p	Physics, engineering, research, education
τ denotes torque in mechanics.	Mechanics	Intermediate	Frequent	Torque 力矩	`\tau`	`U+03C4`	—	τ = r × F	Physics, engineering, research, education
ω denotes angular velocity in mechanics.	Mechanics	Intermediate	Frequent	Angular velocity 角速度	`\omega`	`U+03C9`	—	ω = dθ/dt	Physics, engineering, research, education
α denotes angular acceleration in mechanics.	Mechanics	Intermediate	Frequent	Angular acceleration 角加速度	`\alpha`	`U+03B1`	—	α = dω/dt	Physics, engineering, research, education
I denotes moment of inertia in mechanics.	Mechanics	Intermediate	Frequent	Moment of inertia 转动惯量	`I`	`U+0049`	—	τ = Iα	Physics, engineering, research, education
k denotes spring constant in mechanics.	Mechanics	Intermediate	Frequent	Spring constant 弹簧常量	`k`	`U+006B`	—	F = −kx	Physics, engineering, research, education
μ denotes coefficient of friction in mechanics.	Mechanics	Intermediate	Frequent	Coefficient of friction 摩擦系数	`\mu`	`U+03BC`	—	Fᶠ = μN	Physics, engineering, research, education
ρ denotes density in mechanics.	Mechanics	Intermediate	Frequent	Density 密度	`\rho`	`U+03C1`	—	ρ = m/V	Physics, engineering, research, education
T denotes temperature in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Temperature 温度	`T`	`U+0054`	—	pV = nRT	Physics, engineering, research, education
Q denotes heat in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Heat 热量	`Q`	`U+0051`	—	Q = mcΔT	Physics, engineering, research, education
C denotes heat capacity in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Heat capacity 热容	`C`	`U+0043`	—	C = dQ/dT	Physics, engineering, research, education
cₚ denotes specific heat at constant pressure in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Specific heat at constant pressure 定压比热容	`c_p`	`U+0063 + U+209A`	—	Q = mcₚΔT	Physics, engineering, research, education
S denotes entropy in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Entropy 熵	`S`	`U+0053`	—	dS = δQᵣₑᵥ/T	Physics, engineering, research, education
U denotes internal energy in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Internal energy 内能	`U`	`U+0055`	—	dU = δQ − δW	Physics, engineering, research, education
H denotes enthalpy in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Enthalpy 焓	`H`	`U+0048`	—	H = U + pV	Physics, engineering, research, education
G denotes gibbs free energy in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Gibbs free energy 吉布斯自由能	`G`	`U+0047`	—	G = H − TS	Physics, engineering, research, education
p denotes pressure in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Pressure 压强	`p`	`U+0070`	—	pV = nRT	Physics, engineering, research, education
V denotes volume in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Volume 体积	`V`	`U+0056`	—	pV = nRT	Physics, engineering, research, education
kᴮ denotes boltzmann constant in thermodynamics & statistical physics.	Thermodynamics & Statistical Physics	Intermediate	Frequent	Boltzmann constant 玻尔兹曼常量	`k_B`	`U+006B + U+1D2E`	—	E = kᴮT	Physics, engineering, research, education
q denotes electric charge in electromagnetism.	Electromagnetism	Intermediate	Frequent	Electric charge 电荷量	`q`	`U+0071`	—	F = qE	Physics, engineering, research, education
I denotes electric current in electromagnetism.	Electromagnetism	Intermediate	Frequent	Electric current 电流	`I`	`U+0049`	—	I = dq/dt	Physics, engineering, research, education
V denotes voltage in electromagnetism.	Electromagnetism	Intermediate	Frequent	Voltage 电势差	`V`	`U+0056`	—	V = W/q	Physics, engineering, research, education
R denotes resistance in electromagnetism.	Electromagnetism	Intermediate	Frequent	Resistance 电阻	`R`	`U+0052`	—	V = IR	Physics, engineering, research, education
C denotes capacitance in electromagnetism.	Electromagnetism	Intermediate	Frequent	Capacitance 电容	`C`	`U+0043`	—	C = q/V	Physics, engineering, research, education
L denotes inductance in electromagnetism.	Electromagnetism	Intermediate	Frequent	Inductance 电感	`L`	`U+004C`	—	V = L·dI/dt	Physics, engineering, research, education
E denotes electric field in electromagnetism.	Electromagnetism	Intermediate	Frequent	Electric field 电场	`E`	`U+0045`	—	F = qE	Physics, engineering, research, education
B denotes magnetic flux density in electromagnetism.	Electromagnetism	Intermediate	Frequent	Magnetic flux density 磁感应强度	`B`	`U+0042`	—	F = qv × B	Physics, engineering, research, education
Φ denotes magnetic flux in electromagnetism.	Electromagnetism	Intermediate	Frequent	Magnetic flux 磁通量	`\Phi`	`U+03A6`	—	Φ = ∫B·dA	Physics, engineering, research, education
ε₀ denotes vacuum permittivity in electromagnetism.	Electromagnetism	Intermediate	Frequent	Vacuum permittivity 真空介电常数	`\varepsilon_0`	`U+03B5 + U+2080`	—	c² = 1/(ε₀μ₀)	Physics, engineering, research, education
μ₀ denotes vacuum permeability in electromagnetism.	Electromagnetism	Intermediate	Frequent	Vacuum permeability 真空磁导率	`\mu_0`	`U+03BC + U+2080`	—	c² = 1/(ε₀μ₀)	Physics, engineering, research, education
λ denotes wavelength in optics & waves.	Optics & Waves	Intermediate	Frequent	Wavelength 波长	`\lambda`	`U+03BB`	—	v = fλ	Physics, engineering, research, education
f denotes frequency in optics & waves.	Optics & Waves	Intermediate	Frequent	Frequency 频率	`f`	`U+0066`	—	f = 1/T	Physics, engineering, research, education
ν denotes frequency nu in optics & waves.	Optics & Waves	Intermediate	Frequent	Frequency nu 频率	`\nu`	`U+03BD`	—	E = hν	Physics, engineering, research, education
A denotes amplitude in optics & waves.	Optics & Waves	Intermediate	Frequent	Amplitude 振幅	`A`	`U+0041`	—	y = A sin(kx−ωt)	Physics, engineering, research, education
φ denotes phase in optics & waves.	Optics & Waves	Intermediate	Frequent	Phase 相位	`\phi`	`U+03C6`	—	y = A sin(ωt+φ)	Physics, engineering, research, education
k denotes wavenumber in optics & waves.	Optics & Waves	Intermediate	Frequent	Wavenumber 波数	`k`	`U+006B`	—	k = 2π/λ	Physics, engineering, research, education
n denotes refractive index in optics & waves.	Optics & Waves	Intermediate	Frequent	Refractive index 折射率	`n`	`U+006E`	—	n = c/v	Physics, engineering, research, education
c denotes speed of light in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Speed of light 真空光速	`c`	`U+0063`	—	E = mc²	Physics, engineering, research, education
h denotes planck constant in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Planck constant 普朗克常量	`h`	`U+0068`	—	E = hν	Physics, engineering, research, education
ℏ denotes reduced planck constant in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Reduced Planck constant 约化普朗克常量	`\hbar`	`U+210F`	—	ℏ = h/2π	Physics, engineering, research, education
ψ denotes wave function in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Wave function 波函数	`\psi`	`U+03C8`	—	Ĥψ = Eψ	Physics, engineering, research, education
Ĥ denotes hamiltonian operator in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Hamiltonian operator 哈密顿算符	`\hat H`	`U+0124`	—	Ĥψ = Eψ	Physics, engineering, research, education
γ denotes lorentz factor in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Lorentz factor 洛伦兹因子	`\gamma`	`U+03B3`	—	γ = 1/√(1−v²/c²)	Physics, engineering, research, education
β denotes velocity ratio in relativity & quantum physics.	Relativity & Quantum Physics	Intermediate	Frequent	Velocity ratio 速度比	`\beta`	`U+03B2`	—	β = v/c	Physics, engineering, research, education
Z denotes atomic number in nuclear & particle physics.	Nuclear & Particle Physics	Intermediate	Frequent	Atomic number 原子序数	`Z`	`U+005A`	—	ᴬZX	Physics, engineering, research, education
A denotes mass number in nuclear & particle physics.	Nuclear & Particle Physics	Intermediate	Frequent	Mass number 质量数	`A`	`U+0041`	—	A = Z + N	Physics, engineering, research, education
N denotes neutron number in nuclear & particle physics.	Nuclear & Particle Physics	Intermediate	Frequent	Neutron number 中子数	`N`	`U+004E`	—	N = A − Z	Physics, engineering, research, education
λ denotes decay constant in nuclear & particle physics.	Nuclear & Particle Physics	Intermediate	Frequent	Decay constant 衰变常量	`\lambda`	`U+03BB`	—	N(t)=N₀e⁻ˡᵃᵐᵇᵈᵃᵗ	Physics, engineering, research, education
t½ denotes half-life in nuclear & particle physics.	Nuclear & Particle Physics	Intermediate	Frequent	Half-life 半衰期	`t_{1/2}`	`U+0074 + U+00BD`	—	t½ = ln2/λ	Physics, engineering, research, education
σ denotes cross section in nuclear & particle physics.	Nuclear & Particle Physics	Intermediate	Frequent	Cross section 反应截面	`\sigma`	`U+03C3`	—	R = ΦNσ	Physics, engineering, research, education

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