Radio operators (maritime, aeronautical, amateur etc) use the Q code, a 3 letter code beginning with Q such as QTH which literally means 'What is your location?'. The answer would be 'QTH......'.

In Radio Amateur use QTH has evolved and is now used to describe someone's address / location, the original questioning version has grown a question mark: 'QTH?' or 'ur QTH?'.

Although commonly used in Telephony (speech), the code was developed for Wireless Telegraphy, ie Morse Code, where it helpfully abbreviated a lot of questions that would otherwise take an awful lot of plain language.

Interestingly (well I think it's interesting!) the use of texting on mobile phones has spawned the parallel evolution of abbreviated phrases commonly used in Telegraphy, such as CUAGN, BCNU etc.

I'll go back under my stone now!

JJ