Although Celtic tattoos for men have been around for a very long time, their popularity has grown in recent times. Many times, people are under the impression, that only knotwork makes up Celtic tattoo designs, which is however not true.
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.