Personalized Nuclear Engineer Line Toddler Long Sleeve T-Shirt. Nuclear engineer with a decorative line sporting a radioactive symbol is a unique gift design for engineers and students at back to school, birthdays,holidays and graduation. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.