I'm not exactly sure what all falls under the term hand flapping. My son's whole body is in motion a lot of the time. He dances around in odd ways, flailing his arms at times, but i'm not sure if that would count. He does also rock sometimes while perched on his feet in a squatting position or on his knees with his fists on the floor in front of him for balance, usually while he's talking to someone. He's a bit of a gymnast and quite acrobatic, as he's been REALLY into Spiderman since he was 5, and still is at 11. I'm not quite sure how much of it is just high energy or if he is actually stimming. He's a furniture jumper, trampoline trick fanatic, and cartwheels through the living room instead of walking in about half the time. It drives me nuts when he takes flying leaps onto my bed or the couch instead of just sitting down. He also drums on tabletops and things like that. We've been talking about getting him a bongo set, as he actually keeps a decent beat. I know for sure he's stimming when he makes repetitive noises constantly, but that's the only thing i'm sure about.
Peace.
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SAHM to 3 home schooled boys, ages 11 undiagnosed AS, almost 9 NT, and 4 NT. We also share our home with 13 companion animals including 5 cats, 2 dogs, 3 ferrets, 2 aquatic turtles, and 1 chinese water dragon