A short, semi-rigid whip without a lash. Normally used for horseback riding, but nowadays more often associated with BDSM.
There is widespread confusion between riding crops and teachers' pointers, and teacher characters are often mistakenly depicted holding a riding crop. In general:
A riding crop has some flex to it: it holds it shape but bends when force is applied. It usually widens and flattens into a rectangular shape at its tip.
Pointers are usually thinner and completely rigid. Sometimes they may have an oblong cushion on the end.
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