One or more symbols are used to express mathematical formulae.  A partial list of symbols (currently being developed) is as follows:

Symbols		Meanings
+		positive, addition
-		negative, subtraction
×		mutliplication
÷		division
*		asterisk, multiplcation (computers)
/		slash, forward slash, division (computers)
⁄		fractional slash
±		plus and minus (value can be of either sign)
°		degree, angle
≡		identical to
=		equal sign
<		less than
<=	=<	less than or equal to
>		greater than
>=	=>	greater than or equal to
≈		approximately equal to
%		per cent (n out of 100 parts)
‰		per mille (n out of 1,000 parts)
‱		per myriad (n out of 10,000 parts), per diem, basis point
¤		Currency (but not a specific currency)
#		octothorpe, number sign, cross-hatch
(	)	opening and closing parenthesis (respectively), brackets
ƒ		florin, function
π		pi (the constant ratio of the circumference of a circle to its diameter)
√		square root, radical sign
∞		infinity
…		horizontal ellipsis
′		imperial feet, minutes, [single] prime (not an apostrophe)
″		imperial inches, seconds, double prime (not a quotation mark)

Advanced mathematical operators:

Symbols		Meanings
∀		for all
∂		partial differential
∝		proportional to...
∇		nabla, backward difference
∏		n-ary product, product sign, prod (not the same as the Greek capital letter for "pi" despite its similar appearance)
∑		n-ary sumation, sum (not the same as the Greek capital letter for "sigma" despite its similar appearance)
−		minus sign, subtraction
∗		asterisk operator
∠		angle
∟		right angle
⊥		up tack, orthogonal to, perpendicular
∧		logical "and," wedge
∨		logical "or," vee
∫		integral
∆		increment
∴		therefore
∼		tilde operator, varies with, similar to (not the same as the "tilde" character despite its similar appearance)
≈		almost equal to, asymptotic to
≅		approximately equal to
≡		identical to
≤		less-than or equal to
≥		greater-than or equal to
≠		not equal to
∩		intersection, cap
∪		union, cup
⊂		subset of
⊃		superset of
⊄		not a subset of
⊆		subset of or equal to
⊇		superset of or equal to
∈		element of
∉		not an element of
∋		contains as member, ni (as in Monty Python's The Knights of "Ni")
∃		there exists
∅		empty set, null set, diameter
⊕		circled plus, direct sum
⊗		circled times, vector product
¬		not
⋅		dot operator (not the same as the Georgian comma, a.k.a., "middle dot," despite its similar appearance)