This is the most universal of Hindu symbols and its sound is used in meditation. In Hinduism, the word “Om” is the first syllable in any prayer. More specifically, Om is used to symbolize the universe and the ultimate reality.
Spine tattoo idea ::: A lotus to represent a new beginning, or a hard time in life that has been overcome and the symbol "Hum" from the Buddhist mantra to stand for love, kindness and protection.this symbol is also said to purify hatred and anger.
'Ohm' tattoo that represents 4 different states of consciousness and a world of illusion: waking (jagrat), dreaming (swapna), deep sleep (sushupti), transcendental state (turiya) and world of illusion (maya) - 20 Small Tattoos With Big Meanings