From AmtWiki

In heraldry, vert is the name of a tincture roughly equivalent to the colour "green". It is one of the five dark tinctures (colours). Vert is portrayed in black and white engravings by lines at a 45 degree angle from upper left to lower right, or indicated by the use of vt. as an abbreviation.

Though the English term comes from the French word vert (green), in French heraldry this tincture has been referred to as sinople since at least 1415. In Old French, and in the earlier texts, vert meant "green" while sinople was a "red" color named for the mineral paint from which it acquired its name. It is not clear why the meaning of the word changed in French.

The shortest blazon in the English language is "Vert", which is the blazon of the arms of Pupellin and the flag of Libya between 1977 and 2011.

Vert may represent emeralds or Venus