I found it! I found it!
Here is the written instruction for SKTPO
sktpo - slip next stitch, knit 2 together, pass slipped
And here is the website
that demystifies the abbreviation.
I hope it fits YOUR sktpo prescribed in YOUR pattern!
NOTE: the SKTPO is a decrease of 1 stitch. Does this seem reasonable according to your specific pattern? Is the pattern calling for some kind of shaping? OR, is your pattern creating yarn over
'holes' or 'eyelets' and following the yarn over eyelet...which adds a stitch...the SKTPO is the decrease counterpart? Is your pattern 'lacey' in appearance?