The term 'LONG KEY' is composed of three crossword solutions: SPACE (5 letters), ENTER (5 letters), and SPACEBAR (8 letters). SPACE is a key on a keyboard that is used to create a SPACE between words when typing. ENTER is a key on a keyboard that is used to indicate the end of a line or command. SPACEBAR is a key on a keyboard that is used to create a SPACE between words when typing, and is usually the longest key on the keyboard.