Luckily for you I just helped somebody out with this when he PMed me a couple of days ago.
Now let's see... Where is it again?
Ah yes...
I think that its not the actual symbol as the one in the Fallout games, but I compared it to a smaller version of the one from the games and its pretty darn close. Just a few dimensions here and there have a variation and the color is black and white here.
Are you so sure? After all, it is the same exact picture (including the image location) as I posted in a very similar thread in the Fan Art forum less than a few days ago.
Suspicious. Of course, you realize I'm only pulling your tail.