Machinery's Handbook, 31st Edition
2830
Mathematical Signs and Abbreviations Letter Symbols for Mechanics and Time-Related Phenomena ANSI/ASME Y10.3M-1984
Acceleration, angular Acceleration, due to gravity Acceleration, linear
Height
α (alpha)
h
Inertia, moment of
I or J
g a
Inertia, polar (area) moment of a J
Inertia, product (area) moment of a
Amplitude a
A
I xy
Length
L or l q or w P or W
Load per unit distance a
α (alpha) β (beta) γ (gamma) θ (theta)
Load, total a
Mass
m M
Angle
Moment of force, including bending moment Neutral axis, distance to extreme fiber from a
φ (phi) ψ (psi)
c
Angle, solid
Period
Ω (omega) ω (omega)
T
μ (mu) or ν (nu)
Angular frequency Angular momentum Angular velocity
Poisson’s ratio
Power
L
P
Pressure, normal force per unit area Revolutions per unit of time Second moment of area (second axial moment of area) Radius Second polar moment of area Shear force in beam section a Spring constant (load per unit deflection) a Section modulus Statical moment of any area about a given axis a
ω (omega)
p r n
Arc length
s A
Area
X - X , Y - Y , or Z - Z
Axes, through any point a
I a
Bulk modulus Breadth (width)
I P or J
K b
Z V
Coefficient of expansion, linear a α (alpha)
Coefficient of friction
μ (mu)
k
Concentrated load (same as force) Deflection of beam, max a
Q
F
Strain, normal Strain, shear
ε (epsilon) γ (gamma)
δ (delta) ρ (rho) d , δ (delta), or t D or d
Density
Stress, concentration factor a
Depth
K
Diameter Displacement a Distance, linear a
Stress, normal Stress, shear Temperature b Thickness Time Torque Volume Velocity, linear
σ (sigma) τ (tau) T , or θ (theta) t , or θ (theta) d , δ (delta), or t
u , v , w
Temperature, absolute b
s e
Eccentricity of application of load a Elasticity, modulus of Elasticity, modulus of, in shear Elongation, total a Efficiency a
η (eta)
E G
t
T v V
δ (delta) E k , K , T E P , V , or Φ (phi) N or n
Energy, kinetic Energy, potential Factor of safety a
Wavelength
λ (lambda)
Weight
W W
Weight per unit volume
Force or load, concentrated
γ (gamma)
F f k
Frequency
Work
Gyration, radius of a
a Not specified in Standard b Specified in ANSI Y10.4-1982 (R1988)
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