Occupational therapy like physical therapy but for fine motor control (usually the hands) instead of gross motor control (like the legs). It can also refer to the neurocognitive / attentional ability to engage in complex tasks. In this context I mostly mean splints like this but it can also refer to stim jewelry for people with autism, adhd, and similar that benefit from having fidget items or other stimulating material such as a chew on hand to reduce anxiety / agitation and to help with focus. Basically if you would need it to do a desk job, it probably falls under occupational therapy, but it also includes the same skills but applied to leisure and other activities.
Well clearly Mr. Sanders (of all people) is an antisemite.