A Wave is symbolized as one of the strongest forces on earth. so strength for one. also if you read more into it, its about faith, a wave is you against mother nature, you cannot control it, you just have to put your faith into her.
Wave tattoo, with my baptism dates on either side
Couple Finger Tattoos
If you've been thinking about getting a tattoo, but are keen to opt for something subtle, then a delicate finger tattoo could be just for you.