S.C. Code Ann. § 58-23-1240: "Taxi" plate; certificate of insurance.

The owner of a taxi must obtain and cause to be affixed at all times to the rear of the taxi in a conspicuous place a metal plate or sticker, the dimensions of which must be approved by the city where the taxi principally operates, which shall have on it the words "Taxi", and be of substantially similar design but a different color from the state license plate.

The owner of a taxi that qualifies as a self-insurer, pursuant to Section 56-9-60, must issue to each operator of the taxi a certificate of insurance. The operator of the taxi must maintain a copy of the certificate of insurance in the taxi while it is in operation.