The term 'Kind of Recording' can refer to three different types of recording: Mono (4 letters), ANALOG (6 letters), and TAPE (4 letters). Mono is a type of recording that uses one channel, while ANALOG is a type of recording that uses physical media such as vinyl records or magnetic TAPE. TAPE is a type of recording that uses magnetic TAPE to store audio signals. All three types of recording are still used today, although digital recording has become more popular in recent years.