= equals; double bond
≠ not equal to
≡ identically equal to; equivalent to; triple bond
∼ approximately
≈ approximately equal to
≅ congruent to; approximately equal to
∝ proportional to
< less than
> greater than
≪ much less than
≫ much greater than
≤ less than or equal to
≥ greater than or equal to
→ approaches, tends to; yields; is replaced by
⇒ implies; is replaced by
⇐ is implied by
⇓ mutually implies
⇔ if and only if
⇄ reversible reaction
&NA; perpendicular to
∥ parallel to
&NA; absolute value of
+ plus
− minus
/ divided by
× multiplied by
± plus or minus
√ radical
∫ integral
∑ summation
&NA; product
∂ partial derivative
° degree
°B degrees Baumé
°C degrees Celsius (centigrade)
°F degrees Fahrenheit
! factorial
″ second
′ minute
ε₀ electric constant
μ micro-
μ₀ magnetic constant
μA microampere
μA h microampere hour
μC microcoulomb
μF microfarad
μg microgram
μK microkelvin
μm micrometer
μm micron
μm Hg microns of mercury
μmol micromole
μs, μsec microsecond
μu microunit...