The term LIKE PI is a reference to the mathematical constant pi, which is represented by the GREEK letter π. Pi is an irrational number that is used in many mathematical equations and is equal to the ratio of a circle's circumference to its diameter. It is an important part of geometry and trigonometry and is often used in calculations involving circles and spheres. The crossword solution for LIKE PI is GREEK, referring to the fact that pi is represented by the GREEK letter π.