SIGN is an automobile business in Grand Theft Auto: San Andreas.
The company manufactures and sells neon signs, wall signs and computer signs. They are most likely a Korean business, as the logo is both written in English and Korean.
The branch in East Los Santos appears next to Duval's Mobile Glass, and the branch in Jefferson appears next to Sub Urban. In Market, SIGN is located in a strip mall which also contains a branch of Duval's Mobile Glass, Lillians Appliance and Pik N' Go Market.