Bitwise Operators: not

Mainly used in boolean expressions, it turns TRUE expressions (<> 0) FALSE, and FALSE expressions (== 0) TRUE.

Example
(= Result not TRUE) /* the result will be FALSE */

(= Result not FALSE) /* the result will be TRUE */

(= Result not 5) /* the result will be 0 */

(= Result not 0) /* the result will be 1 */