Out Of The Barn

K- knit

P-Purl

St- Stitch or Sts- Stitches

B- Work through back loop of the stitch. 

Sl- Slip. To pass a stitch or stitches from the left-hand needle to the right-hand needle without working them.  The right-hand needle is always inserted into a stitch that is to be slipped as if to purl  (i.e., from the right -hand side), unless directions specify “as if to knit” or “knitwise” (i.e., from the left-hand side).

Sl st- Slip-stitch. A stitch that has been slipped.

Wyib- With yarn in back.  Used with slip- stitches, it means that the yarn is carried across behind  the stitch, on the side of the fabric that is away from the knitter.  Whether this is a right or wrong side makes not difference.

Wyif- With yarn in front.  When a stitch is slipped, the yarn is carried across in front fo the stitch, on the side that is facing the knitter.

Rep - Repeat.

Rep From * - Repeat all material that comes after the *, in the same order. ( ) Parentheses- Indicates a repeat of material with in teh parentheses (or brackets) as many times as specified immediately after them; i.e., “(k2 tog, k1) 3 times” means: k2 tog, kn1, k2 tog, k1.

Taken from  A Second Treasury Of Knitting Patterns by Barbara G. Walker.