Symbols and names of the symbols.

+                   Addition
-                    Subtraction sign, minus sign
x or ⋅             multiplication sign
÷ or /             division sign
=                   equal
≠                   not equal
<                   less than
>                   greater than
≤                   less than or equal to
≥                   greater than or equal to
#                   number sign
( )                  parentheses & and (ampersand)
%                  percent
π                   pi
|x|                  absolute value of x
√                   square root
!                    factorial
±                   plus or minus

∠                  angle
°                   degree
⊥                  perpendicular
||                   parallel
∼                  is similar to (tilde)
∪                  union
∩                  intersection
∅                 null or empty set
∈                  is a member of
∉                  is not a member of
⊂                  is a subset of
∃                  there exists (existential quantifier)
∀                 for all (universal quantifier)
f(x)               a function whose variable is x
∴                 therefore
Σ                  sum
...                 ellipsis (and so on)
∞                  infinity