Misericord

A misericord (sometimes named mercy seat, like the Biblical object) is a small wooden structure formed on the underside of a folding seat in a church which, when the seat is folded up, is intended to act as a shelf to support a person in a partially standing position during long periods of prayer.

Prayers in the early medieval church at the daily divine offices (i.e. Matins, Lauds, Prime, Terce, Sext, None, Vespers, and Compline) were said standing with uplifted hands. The old or infirm could use crutches or, as time went on, a misericordia (literally "act of mercy"). For these times of required standing, seating was constructed so that the seats could be turned up. However, the undersides sometimes had a small shelf, a misericord, allowing the user to lean against it, slightly reducing their discomfort. Like most other medieval woodwork in churches, they were usually skilfully carved and often show detailed scenes, despite being hidden underneath the seats, especially in the choir stalls of the choir around the altar.

Misericords in English churches date from the start of the 13th century right up until the 21st century, although after the beginning of the 17th century they are viewed as modern copies with little or no historical importance. Remnant's 1969 catalogue dismisses everything after that date as "modern", rarely even affording it a description, but there are many wonderful carvings from the Victorian era, and even the modern day. The earliest set of misericords can be found in the choir stalls of Exeter Cathedral and dates from the middle of the 13th century. The vast majority of English misericords date from the 14th and 15th centuries and are curiously most often depictions of secular or pagan images and scenes, entirely at odds with the Christian iconography and aesthetic that surround them.

...
Wikipedia