On a blue vertical rectangle arched convexly at top and bottom and edged with a 1/8 inch (.32 cm) blue border, a gray cougar head, face affronté, garnished blue and white issuant from sinister within the cusps and surmounting a white crescent. Attached above a gray arched scroll edged with a 1/8 inch (.32 cm) blue border inscribed "CENTENNIAL" in blue letters. Attached below a gray arched scroll edged with a 1/8 inch (.32 cm) blue border inscribed "HIGH SCHOOL" in blue letters.
Blue and gray are the school colors and the cougar is the school mascot. The crescent alludes to the letter "C", the Roman numeral for 100, denoting a centennial and resembles the letter "C", the first letter of the school name.
The shoulder sleeve insignia was authorized on 16 March 1998.