Answer: Wish I could shed some light on the meaning of the plant tag but what you've picked up is a grower's tag and it would mean different things to different growers. Plants at the grower's are identified by a type of shorthand (sometimes known only to the growers!) that indicates when and what type fertilizer and growth hormone/inhibitor is used, plus sunny or shady conditions, etc. There is no universal usage so there is no specific sheet of information I can steer you towards.
Best wishes with your garden!
Q&A Library Searching Tips