It's a windscreen to the limeys, but it's one of these to us Yanks
If you are a Limey 
and you are called upon to visit the United States, write this ..... windscreen n. [DOC] [TLE] The Septic's Companion - British Slang Glossary [PAR] Many American tourists are confronted with this word quite rapidly after ... 
Americans (and also Brits, as our languages merge ever closer) would call such 
a person a geek.