A double whole rest is also known as what?

A double whole rest is indeed known as a breve rest. This term refers to a rest that lasts for twice the duration of a whole note, or a double whole note. In musical notation, the breve rest looks similar to a filled-in rectangular shape, indicating that no sound should be produced for the length of the breve.

Understanding the terminology is crucial in music theory, especially when interpreting musical scores. The other types of rests mentioned serve different purposes. A whole rest denotes silence for the duration of a whole note, a half rest signifies silence for the duration of a half note, and a quarter rest indicates silence for the duration of a quarter note. By recognizing the specific names and durations of these rests, musicians can more accurately read and interpret sheet music.