I always have at least one ball of yarn in my purse. I knit during my lunch break at work, when I'm in a doctor's waiting room, waiting for water to boil when making dinner, watching Halt and Catch Fire at night, and any other time I'm sitting still. When I had an hour long Chicago traffic commute, I would sometimes get a row in if an accident completely stopped traffic. At the same time, I was finishing my MS in Statistics, and knitting as I watched my online courses. If I got stuck on a problem in Python, the rhythmic clicking would help clear my head. The hard part was stopping after only a few rows.
I know I'm not the only knitter to think about doing it in meetings, but after the heated discussion on the Ask a Manager advice site a few months ago, I know I can't pull it off. I just bring a notepad and stick to doodling when I need to occupy my hands at work.