C keywords are overloaded with serveral meanings

Symbol	Meaning
Static	Inside a function, retains its value between CILS At the function level, visible only in this file.
Extern	Applied to a function definition, has global scope (and is redundant) Applied to a variable, defined elsewhere.
Void	As the return type of a function, doesn't return a value In a pointer declaration, the type of a generic pointer. In a parameter list, takes no parameters
*	The multiplicaton Operator Applied to a pointer, indirection In a declaration, a pointer.
&	Bitwise AND operator Address-of operator.
= =	Assignment operator Comparision Operator
<= <=	Less-than-or-Equal-to operator Compound shift-left assignment operator.
< <	Less-than Operator Left delimiter in # include direve ve
()	Enclose formal parameters in a function definition Make a function call Provide expression Precedence Convert (CAST) a value to a different type Define a macro with arguments Make a macro call with arguments Enclose the operand of the sizeof operator when it is a typename.