In Rome and Greece, seahorse is the sacred power of Poseidon and Neptune. Seahorse Tattoo mainly symbolizes power and authority. Chinese culture regards seahorses as a kind of sea dragon, so they are respected for their power and considered as a symbol of good luck. For a long time, sailors thought seahorse was a charm of good luck.
Seahorse is the concept of perception. Seahorse's vision is very sharp, each eye moves independently. Regard this as the symbolic information of the perception and consciousness of the surrounding situation. Seahorse is a symbol of inflexibility or stubbornness. The seahorse wraps its tail around the nearest object to hold itself in turbulent waters.
Source: @geisha_tattoo_