We know that a language must have set of symbols, which are used to create meaningful words. The C Language also have set of symbols.
Here is the list of symbols ( characters ) present in C Language:

These symbols are basically called C Character set. These are categories as follow:
Alphanumerics
It includes alphabets both uppercase and lowercase from A to Z and a to z and numericals values from 0 to 9.
Special Characters / Operators
~ ! @ # ^ ( ) – _ = [ ] { } \ | ; : ‘ ” , < . > ? + % / &
Whitespace Characters ( Used to separate symbols )
Symbol | Name | |
‘ ‘ | Space/White Space | |
\t | Horizontal tab | |
\v | Vertical tab |
Escape Sequences
Special character combinations that represent characters not easily typed:
Symbol | Name | Description |
\n | New line | |
\\ | Backslash | |
\’ | Single quote | |
\” | Double quote | |
\0 | Null character | |
\r | Carriage return | |
\b | Backspace | |
\f | Form feed |