The classic usage for Brits is the 'ordnance survey' (maps) which originate in the need for accurate maps when calculating angles for artillery! Also, while I'

The classic usage for Brits is the 'ordnance survey' (maps) which originate in the need for accurate maps when calculating angles for artillery! Also, while I'm a native speaker who does know this one I think it's obscure enough that most don't. In fact I suspect it's obscure enough that the mis-spelling will replace it eventually anyway. Incidentally the products of magnet fishing often turn up on Reddit's /r/whatisthisthing sub. You also see quite a few munitions. Often enough, in fact, that they have a munitions bot that warns people to contact the authorities (and not, e.g., twist the end to see if it comes off...)