The term 'Diligent Insect' is a reference to the ANT, which is a three-letter word. Ants are known for their hardworking nature and are among the most industrious of all insects. They are capable of carrying up to 50 times their own body weight and can work together in large groups to build complex structures. Ants are also known for their ability to find food sources and store them for later use. This makes them an important part of the ecosystem, as they help to spread nutrients and provide food for other animals.