Horn output is the sound produced by a horn, which is a device used to produce a loud noise. The term can be broken down into three parts: 'TOOTS' (5 letters), 'TOOT' (4 letters), and 'HONKS' (5 letters). TOOTS are short, sharp sounds that are often used to get someone's attention. TOOT is a variation of TOOTS, and it is usually used to describe a short, low-pitched sound. HONKS are longer, louder sounds that are often used to warn people of danger. All three terms are used to describe the sound produced by a horn.