What is an Om T-shirt? This Om shirt is a v-neck style shirt with a silver Om symbol, or Aum is a sacred sound and a spiritual symbol in Indian religions. The Om T-shirt has the Devanagari script as Om Symbol. The Om Symbol in the Om T-shirt signifies the essence of the ultimate reality, consciousness. The Om symbol meaning unification within Hinduism. People think about Om to bring those three parts of yourself—the mind, the body, and the spirit—together. The Om T-shirt comes in white and black colors.