On a Silver metal and enamel device 1 1/8 inches (2.86 cm) in height overall consisting of a shield blazoned: Per quartered Celeste and Argent, a cross nowy of a lozenge Argent (Silver Gray), bearing a demi-cougar passant reguardant of the first with one leg up and looking back, between in the first quarter, an atomic symbol; the second quarter, a balance scale; the third quarter, a lamp of knowledge and in the fourth quarter, a lighthouse upon a mount beaconed all of the third, all within a diminished Silver Gray border. Attached to the sides and below the shield, a Black triparted scroll with dovetailed ends, inscribed "SOUTH BRUNSWICK HIGH SCHOOL." in Silver.
Carolina blue and white are the school colors. The Cougar is the school's mascot. The shield is a symbol for protection and represents defending what is valued most. The atomic symbol and lighthouse reflects the rich history of the community in nuclear power and seafaring. The balance scale symbolizes the balance between school and community service. The lamp represents academic achievement and knowledge.
The shoulder loop insignia was authorized 9 November 2012.