The term 'short high-pitched sound' can be described by two words: 'PING' (4 letters) and 'PIP' (3 letters). A PING is a sharp, high-pitched sound that is usually short in duration. It is often used to indicate the presence of an object or to locate its position. A PIP is a similar sound, but it is usually shorter and higher in pitch than a PING. Both words are commonly used to describe a sound made by a device or machine.