Start to type is a phrase used to describe the process of beginning to type on a keyboard. The crossword solutions for this phrase are PROTO (5 letters), LINO (4 letters), and STEREO (6 letters). PROTO is short for prototype, which is an early version of a product or system that is used to test its design and features. LINO is short for linotype, which is a machine used in printing and typesetting. STEREO is short for stereophonic, which is a method of sound reproduction that creates an illusion of directionality and depth.