The standard abbreviation for garter stitch, a highly textured and reversible knitted fabric. In flat knitting, it is created by knitting every row. In circular knitting, it requires alternating one knit round with one purl round. Pattern writers use this shorthand to save space in row-by-row instructions.
Heard on the job
Row 5 says to work 10 stitches in g st before starting the cable panel.