The term 'Colonial Insect' refers to the ANT, which is a three-letter word. Ants are social insects that live in colonies and are found all over the world. They are known for their organized behavior and their ability to work together to build complex structures. Ants are also known for their ability to communicate with each other through chemical signals. They are an important part of many ecosystems, as they help to break down organic matter and recycle nutrients.