It's not a standard abbreviation I am familiar with. It sounds like another designer/detailer that was too lazy to spell it out. Hey, he saved his department 35 seconds and cost your department nothing but headaches. Not that its his problem.

That's why I tracked all the "down time" in the fabrication department when I was the fabrication manager. Every time my welders had to stop and wait for engineering to provide clarification or information, I recorded the time we lost. I handed the engineering director an invoice for the "cost" to my department. The first time it happened he laughed and thought it was a joke, the second time it happened and he saw that it amounted to many thousands of dollars he stopped laughing and things started to change.

Best regards - Al