quicko: gaffer tape

I was for years under the mistaken notion that Australians had this wonderful, marvelous substance known as "gaffa" tape ... until recently the penny dropped and I realized it was exactly the same wonderful, marvelous substance I knew as "gaffer" tape.  Should have seen it coming by now, I know, but ... umm ... in my defense, I really never use it, I just hear theatre people talk about it.  It was duct tape my brother made a shirt out of.  That I'd be way more up on ... maybe.