WON=Keeping wool at front of right hand needle so that it will pass over needle (w.o.n. = wool over needle) in order to make a loop at side edge, K2 tog. (2 sts. on right hand needle)
still searching for the WRN
update: (wrn or won) To make a stitch in this way the thread is passed over or round the right needle before working the next stitch. A "wool round the needle" (wrn) adds one stitch if knitted once in the next row. However, in some patterns this stitch is worked into more than once, so that several extra stitches are made. When making more than one increase work the stitch as follows: k 1, p 1, k 1, alternately into the same stitch. to compensate for extra stitches made in this way, decrease by taking 2 stitches together, generally on the same row, or knitting the "made stitch" with the next stitch on the following row. Most openwork patterns are formed by "made" stitches and sometimes they form a link effect when drawn over several stitches.
There are several ways of "making" stitches according to how the thread is passed round or over the needle. Therefore when following a pattern read the instructions carefully.
man, I hope that helps.. there isn't much out there about this topic... I'm sure once Amy comes on, she could help you.. or one of the mod squad..