What is SKP?

when a pattern says SKP,what does that mean?

this is the pattern http://www.klaam.com/sheknits/PDF%20files/Child%20Vest.pdf

Since it says it’s a decrease, I’m guessing it’s slip, knit, purl. Anyone else?

Slip, knit, pass. Slip one stitch, knit the next, then pass the slipped stitch over the knitted one to decrease by one.

thank you so much:)