Finger pillory Wikipedia
A finger pillory is a style of restraint where the fingers are held in a wooden block, using an L-shaped hole to keep the knuckle bent inside the block. The name is taken from the pillory, a much larger device used to secure the head and hands, teeth and neck.
Finger stocks were also used in churches for minor offences, like not paying attention during a sermon. An example still survives in St Helen's Church, Ashby-de-la-Zouch, Leicestershire, England.