The Cable and Telecommunications Professionals' Reference, 3rd Edition

19  Trigonometric Functions and General Formulae

J. Barron

Mathematical Signs and Symbols

Sign, symbol	Quantity
=	equal to
≠	not equal to
≡	identically equal to
Δ	corresponds to
≈	approximately equal to
→	approaches
∝	proportional to
∞	infinity
<	smaller than
>	larger than
≤	smaller than or equal to
≥	larger than or equal to
|a|	magnitude of a
an	a raised to the power n
	square root of a
	mean value of a
p!	factorial p (1 × 2 × 3 × . . . × p)
binomial coefficient
Σ	Sum
Π	Product
f(x)	function f of the ...