The term 'It Has Its Limits' can be represented by three words: CALCULUS (8 letters), CITY (4 letters), and TOWN (4 letters). CALCULUS is a branch of mathematics that studies the rate of change of functions and is used to solve problems in science, engineering, economics, and other fields. A CITY is a large human settlement with a variety of buildings, people, and activities. A TOWN is a smaller human settlement than a CITY, usually with fewer people and less infrastructure. Both cities and towns are limited in size and resources, and this is what the phrase 'It Has Its Limits' is referring to.