C keywords are overloaded with serveral meanings

Symbol	Meaning
static	Inside a function, retains its value between calls 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 directive
()	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.