Stimming can include:
repeating words or phrases, head-banging, fidgeting, tapping, humming, snapping fingers repeatedly, pacing, whistling, repetitive blinking, rocking, picking, grinding teeth, tapping your pencil, staring off into space, joint cracking, chewing on inedible items, walking on tiptoe, making sounds, complex body movements, punching objects, hair-twirling, jumping, hand flapping, bitting the inside of the mouth, sniffing or licking objects, spinning, nail-biting.