Slip one stitch knitwise. Slip a second stitch knitwise. Slip both stitches back from right to left needle. Purl both stitches together through the back loops.
Sunday Knits techniques - ssp
Working a Slip, Slip, Purl (ssp) Stitch
Learn to Knit: K2tog, knit two sts together
How to knit: SSP (slip slip purl)
How to Knit - Slip, Slip, Purl
SSP – slip, slip, purl two together through the back loop: sl1 knitwise, sl1 knitwise, p2tog tbl . . . This decrease can come in handy if you want to
How to Work a Slip Slip Purl (SSP) in Knitting
Knitting – natalie's oddities
KNIT S-PT ALL IN ONE - オールインワン