Soren,
I think Sam Morse's code didn't include any punctuation marks, so they ended up having to use that word[stop] to designate the end of a sentence.
Cheers,
Dwight
(now you just KNEW I couldn't end this response o' mine without a "joke", RIGHT?......OKAY........
Western Union
To G W Bush
Dear Dubya I hear we're about to invade Iran stop
Signed Dwight)