I had never seen this before in my life, and then I saw it twice today.
A circle. Within the circle, the number 26.2. That’s it. Oh, and the second time I saw it, a circle with the number 13.1, and another next to it, with the number 26.2.
WTF? 
It means that person has completed two marathons (26.2 miles each) and one half-marathon (13.1).
Oops: Editing because I now see that you’re talking about two different people. Same basic answer, though.
My best guess–something they got after running a full (26.2 mi) or half (13.1mi) marathon.
Wow, that was quick. And painfully obvious now! :smack:
Oh, so that’s what those are! I saw two different ones with different numbers on two cars parked close together the other day, and was totally befuddled. Thanks!
Meanwhile, if you ever see a bumper sticker that says “26 + 6” or “26 + 6 = 1”, that’s someone in favor of Irish re-unification. There are 26 counties in the Republic of Ireland, and 6 in Northern Ireland that are part of the UK.
If you see the last two numbers, it means that they swam and cycled before doing the half or full marathon. 
In case that’s not clear to everyone, 70.3 is the half Ironman distance and 140.6 is the full Ironman distance.
-Telemark (who has a 26.2 magnet on his car)
I see some subtle irony in putting a marathon “merit badge” on an automobile. The car would have beat you any day of the week. 
Interesting. I ran ten marathons yeas ago, and all I ever got was a lousy t-shirt. Not even that at Boston.
So this has nothing to do with replacing the alphabet?
Dammit, people, we need the decibet.
A friend has a 26.2X10 badge on his car for the 10 he’s run. I don’t think it goes through a committe or anything, surely you can just buy one!
For further clarification, the full Ironman is a 2.4-mile swim, 112-mile bike, and 26.2-mile run.
Scarlett (who also sports a 26.2 sticker)
Zombies run marathons too.
Most commonly occurring injury in zombie runners?
Spraaaaaains.
On topic: Does it make me a bad person that I ‘meh’ pretty hard at 13.1 stickers?
I want an “0.262” sticker for my car.
I saw a sticker a few months ago that said simply “0.0”
I want one that says “Couch-to-comfy-chair.”
Um, yeah. 13.1 miles is nothing to sneeze at. And many dedicated half-marathon runners I’ve talked to just don’t have 26.2 in them. Doesn’t make 13.1 any less of an accomplishment.