Dolphins are strongly social animals and they love playing.
That´s why they are a symbol of friendship, playfulness and joy.
This dolphin tattoo was designed using stylized waves as a symbol of fertility and femininity.
The following version with bolder lines is apt for smaller sizes too:
Unicorn pegasus by TattooTribesRelated tattoos:

Friendship, joy

Ocean

Heartbeat

Integration

Triskell

Rebirth, new start

Protection and prosperity

Sea and land

Joy of living

Waves

Stylized waves