That was the name given to the stock once super 16 was introduced. As far as I know standard 16mm can be either single or double perf.
The name never changed because the stock didn't. You just had to avoid double-perf. Super-8 had a smaller perforation in a different place. The only common parameter with 8mm. was the width of the film.
In fact I came unstuck on a student film shot in 1.66 soft matte widescreen on 4:3 when I specified single-perf '47 and we had to pay for an optical when the editor (oh, hang on, that was me as well) wanted to flop a shot. With double-perf the shot could just have been reversed in the neg cut, at the cost of a bit of sharpness. So we got our money's worth by having a freeze frame as well.
Edited by Mark Dunn, 15 February 2014 - 01:55 PM.