What does Em mean in violin?

In musical notation, the abbreviation "Em" stands for "E minor." It is used to denote the key or chord of E minor, which is a minor key or chord based on the note E. The "E" refers to the root note of the key or chord, and the "m" indicates that it is minor. It is important to note that the exact context or usage of the abbreviation "Em" may vary depending on the specific piece of music or musical context.