Define the term monogram. why are they used by artists?

Monogram: is a motif can be 2 or more letters (like someone's initials or signature) they are usually interwoven or combined in a decorative design, used as a logo or any other source to identify a personal possession. 
Artist use it sign their work so that people know who painted the piece.

A monogram is a character with two or more letters they use that to tell apart there work from others also to make it look unique.

Ilearned in arecent video that was a main tour of israel that it's not just a simple town. it's a town with deep secrets and many wonderous places to visit. isreal has a lot of christian tolerance and it holds a lot of history.