A spelling alphabet, raio alphabet, or telephone alphabet is a set of words which are used to stand for the letters of an alphabet. Each word in the spelling alphabet typically replaces the name of the letter with which it starts (acrophony). It is used to spell out words when speaking to someone not able to see the speaker, meaning there are no visual cues which assist the listener (the McGurk effect). Giving one's name over the telephone is a common scenario where a spelling alphabet is often used. Spelling alphabets are often called phonetic alphabets. However, phonetic transcription systems such as the International Phonetic Alphabet are designed to record detailed information about the sounds of human speech. As written representations of spoken sounds, they are utterly different from spelling alphabets, which are spoken representations of written symbols.