The term 'some trigonometry functions' refers to a group of mathematical functions that are used to describe relationships involving angles and lengths of triangles. The most commonly used trigonometric functions are sines, which is a five-letter word that can be found in crossword puzzles. Sines are used to calculate the ratio of the length of the side of a triangle to the length of the hypotenuse. They are also used to calculate the angle between two lines or the angle between two points on a circle.