A Wave is symbolized as one of the strongest forces on earth (Strength). 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.
My third tattoo - Inguz signals the integration of the four selves: physical, emotional, mental and spiritual. It is the drive toward completion and totality and acts as the catalyst for movement toward wholeness that is found within ones self.
Theese are NOT viking runes. They are an older Rune alphabet, from around year 500 and earlier. They are called the elder futhark. The viking Rune alphabets have usually only 16 runes and there are several different alphabets from that time.