Equals sign

The equal sign "=" is a symbol used to indicate equality. It looks like two parallel horizontal lines. Computers display the equals sign with the Unicode or ASCII character 003D (in hexadecimal).
Similar symbols.
The symbol used to say when items are not equal is "≠" (slashed equal sign). 
There are several symbols that can be used to say items are "approximately the same," "similar to" or "about equal." Some of these symbols include:
Each of these symbols has more than one possible meaning, and are all used to state that two things are about equal (or equivalent in some way).