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.
According to the Native Americans, crossed arrows represent friendship, an arrow pointing right meansprotection, and pointing left wards off evil. I like how each in this is different birth stone thing again.