# of stitches decreased	direction of slant on work	abbreviation	meaning	method
one	right	k2tog	knit 2 stitches together	Knit 2 stitches together as if 1 to form 1 stitch. Here's how: put your right needle just to the left of the second stitch, insert it toward the right through the middle of both of the 2 stitches, wrap yarn as you normally do to knit, bring the new stitch on your right needle through the 2 old stitches and pull the 2 old stitches off your left needle, just as you would with a regular knit stitch.
two	right	k3tog	knit 3 stitches together	like k2tog, above, except 3, rather than 2, stitches are knit together as if one, leaving 1 stitch where there were 3.
one	right	p2tog	purl 2 stitches together	purl 2 stitches together as if 1 to form 1 stitch.  Here's how:  put your right needle through the center of 2 stitches from right to left, wrap yarn as you normally do to purl, bring the new stitch on your right needle through the 2 old stitches and pull the 2 old stitches off your left needle, just as you would with a regular purl stitch.
one	right	p3tog	purl 3 stitches together	like p2tog, above, except 3, rather than 2, stitches are purled together as if one, leaving 1 stitch where there were 3.
one	left	k2tog tbl	knit 2 stitches together through the back of loops	insert right-hand needle through the middle of the 2 left hand stitches and out the back and knit the 2 stitches together to get a mirror image of k2tog.
one	left	p2tog tbl	purl 2 stitches together through the back of loops	insert right-hand needle through the back and into the middle of the 2 stitches, pointing from left to right,
one	left	ssk	slip,slip,knit	slip 1 stitch as if to knit, slip 1 more stitch as if to knit, insert left needle in the front of the 2 slipped stitches from right to left so that needles are in standard knit position and knit the 2 stitches together.
one	left	ssp	slip,slip,purl	slip 1 stitch as if to purl, slip 1 more stitch as if to purl, insert left needle into the back of the 2 slipped stitches from right to left so that needle are in standard purl position and purl the 2 stitches together.
one	left	s1, k1, psso	slip, knit, pass over	slip 1 stitch as if to knit, knit the next 1 stitch, pass the slipped stitch over the 1 knit stitch and off the needle.
one	left	skpo	slip, knit, pass over	same as s1, k1, psso (above)
two	left	s1,k2tog,psso	slip, knit 2 together, pass over	slip 1 stitch as if to knit, knit 2 stitches together, pass the slipped stitch over the one stitch (resulting from the 2 that were just knit together) and off the needle.
two	centered	dd	centered double decrease	insert the right needle as you would to knit 2 together (above) but just slip those 2 stitches in that position onto the right needle, knit the next stitch, then pass the 2 slipped stitches over the 1 stitch you just knit.
two	centered	s2, k1, pss2o	slip 2, knit1, pass 2 over	same as centered dd (above)