Yes, ok, the abbreviation may leave something to be desired, but it is a decrease I love and use often.
I first encountered it in sock knitting, as part of the gusset decrease.
I was working on a pair of socks just the other day (black socks, naturally), and I remembered the clever trick I learned from Cat Bordhi...
If you're working a vertical line of ssk decreases with even rows/rounds in between, the line can look wobbly... to combat that, knit the stitch immediately above through the back loop. (Mentioned in the Gusset section of this pattern.)
Tidies things up very nicely!