What is Colon ?
Colon is (noun) 1. the main part of the large intestine, going from the small intestine to the rectum The intestines are divided into two parts: the small intestine and the large intestine or colon. 2. a printing sign (:) Use a colon before starting a list. A colon is used after a letter to indicate one of the drives in a computer.
source: Easier English, Student Dictionary Upper Intermediate Level