Personalized Patterned Ohm Symbol Long Sleeve T-Shirt. An ohm symbol with a black and gray pattern is a unique gift design for electical and computer engineers and engineering college students at back to school, birthdays, holidays and graduation. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL