I know this is a little odd but it should turn out fun as well. So all you need to do is explain why you have that sign on name and what it means. Mine is whistle8mp because in the town I grew up in my buddys and I used to hang out on the railroad tracks, I must have been fourteen and every time there was a road crossing there was a granite post in the ground that had a W and a number under it to let the conductor know when to blow his whistle. So we used to hand out at W 8 hence whistle8. Well I'm not going to get into it but there was a tragic event that happened one summer day that I will never forget so I have whistle8mp to remember that spot and to never forget my friend.The mp are my initials.