+ plus
- minus multiplied by ;times
divided by
= equals
approximately equals
not equal to
less than
greater than
equal to or less than
equal to or greater than round brackets ;parentheses square brackets
{ } braces
is a member of the set
is a subset of
∽ similar to
≌ congruent to denotes an operation
therefore
∵ because
∶ ratio sign, divided by
∷ equals