Probably the most identifiable icon of the Fallout series save Vault-Boy himself, but something that a lazy forum search reveals is rarely discussed. Here's the place to discuss the Pip-Boy in all it's glory, both as handy game interface and real world artifact in the Fallout Universe.
They're sort of weird if you think about it. I'm sure everyone has questions about them, or answers. I'll start with a couple 'real world' questions--
Why were vault dwellers given Pip-Boys in the first place? Aren't there applications primarily military?
Why haven't we ever seen them for sale, or been able to loot them from corpses?
As for their function as game interface --
I believe that no matter how contrived it may be for the character to acquire one (lookin' at you, Courier :stare: ), it just plain wouldn't be Fallout without one.