In Victoria Australia we have 5 letters or numerals on a bike (6 on a car) Yesterday as a result of this thread I ordered WDGLD it's 2 weeks off but when it's on my bike I'm posting it.
My favorite is The guy on here from TX with the red road glide custom. His is INFDEL. I can't remember his forum name, but he's got a pic of it for his avatar.
In Ontario my Ultra has the licence plate 'BIG 1'. Our provincial slogan is 'For You to Discover'. Had this for over 25 years and it still gets a chuckle.