Note that this isn't a complete list, because I'm only listing the symbols that I've encountered. I have placeholders for the entire Greek/Roman alphabet though, so I don't have to add lines in later.

Α - α - Angular acceleration (radians/second^2) Β - β - Relativity-related ratio (u/c) Γ - γ - Relativity constant (1/sqrt(1-(u^2/c^2)); γ>>1 implies 'relativistic speed' ) Δ - Difference of (final-initial) δ - Impulse function (ie. δ(x)); deformation of an object under normal-axial loading (meter) Ε - Youngs Modulus, Modulus of Rigidity (Newtons/meter^2 or Pascals) ε - Normal Strain (unitless by definition: δ/L) Ζ - ζ - Damping ratio in a spring system Η - η - Performance (Desired output/required input: W[sub]net,out[/sub]/Q[sub]in[/sub]) Θ - θ - Angular position, Angle (degrees) Ι - ι - Κ - κ - Λ - λ - Wavelength (meters) Μ - μ - Coefficient of friction (μ[sub]k[/sub]) Ν - ν - Frequency (hertz, 1/sec); specific weight (1/ρ: meter^3/kilogram) Ξ - ξ - Ο - ο - Π - Product operator π - Mathematical constant (3.141592654...) ϖ - Ρ - ρ - Density (kilograms/meter^3); Radius of Curvature, [(1+(dy/dx)^2)^(3/2)]/[d^2y/dx^2] (meters) Σ - Summation operator σ - Normal Stress (Newtons/meter^2 or Pascals) ς - Τ - τ - Torque (newton-meters); Shear Stress (Newtons/meter^2 or Pascals) Υ - υ - Φ - Angle (radians) φ - Angle of Twist (radians) Χ - χ - Ψ - ψ - Ω - Resistance (ohms) ω - Angular velocity/frequency (radians/second) A - a - Linear acceleration (meters/second^2) B - b - C - c - Speed of light constant (299,792,458 meters/second) D - d - Derivative (ie. dx/dt), Distance (meters) E - e - F - Force (newtons) f - G - Gravitational constant (6.67E-11 newton-meters^2/kilogram^2); Shear Modulus () g - Gravitational acceleration (9.81 meters/second^2 downwards) H - h - Plancks Constant (6.62606896E-34 joule-seconds) I - Moment of Inertia (kilograms/meter^2), Electric current (amperes) i - J - Polar Moment of Inertia (kilograms*meters^2) j - Imaginary number (sqrt(-1)) K - Kinetic energy of a system (joules) k - L - Length (meters) l - Relativistic length (meters) M - m - Mass (kilograms) N - Newtons (kilogram-meters/second^2) n - O - o - P - Mechanical Power (Newton-meters), Electrical Power (amps^2-ohms, volts^2/amp) p - Momentum, Pressure (Newton/meters^2) Q - Electrical Charge (coulombs, ampere-seconds, farad-volts) q - R - Ideal Gas Constant ([kiloPascals*kilogram]/[meter^3*Kelvin]) r - Radius (meters) S - Relativistic Inertial Reference Frame (nonmoving compared to other reference frame, S') s - T - t - Time (seconds; relativity special case t[sub]0[/sub] is 'proper time', ie. from inertial reference frame S, not S') U - Gravitational potential energy of a system (joules) u - Relativistic velocity between two inertial frames of reference (meters/second) V - Electric potential (volts) v - Linear velocity (meters/second) W - Work (joules) w - X - x - Horizontal Position (meters) Y - y - Vertical Position (meters) Z - z - Z-axis position (meters)