What does the musical term prestissimo mean?

The musical term "prestissimo" means to perform at an extremely fast tempo, faster than "presto". It is used to indicate that the music should be played or sung with great speed and urgency. The term is often used in orchestral or instrumental music, particularly in passages that require a rapid sequence of notes or a very fast tempo. "Prestissimo" is one of the fastest tempo markings in music notation.