Question

What is a notation knife?

Answer 1

Notation knives are extremely rare. They're knives with musical notes on the blade.

Answer 2

A notation knife is a knife that has musical notes on the blade. The name comes from the fact that a "notation" is the written version of a process, such as the process of creating particular sounds in music. The knives were usually etched with notations that were intended to represent gratitude for the meal being served.