This is a left-leaning decrease sometimes used in knitting. It is usually called the "pass slipped stitch over" decrease (psso), or the k1, sl1, psso (knit one, slip one, pass slipped stitch over). Shown in the continental style.
by Hello Pixel Art
by Lan Anh Handmade
by DreamcatcherDIY
by ItsKhyati
by TwinkieChanTV
by Tanis GallerY
by Mukta Art & Craft