The term SINE is a mathematical concept that is used to describe a wave-like pattern. It is an acronym for 'sine of the angle' and is represented by the symbol sin. The crossword solutions for SINE are RATIO (5 letters) and DIE (3 letters). RATIO is a mathematical term that describes the relationship between two numbers or quantities, while DIE is a three-dimensional object with six faces, each of which has a different number of dots.