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 it.
I have a wave tattoo as well, and it means the world to me because it reminds me of home. I grew up right on the ocean, and everything about being by water brings me peace, and always reminds me how small i really am in the spectrum of things.