knout
A leather scourge (multi-tail whip), in the severe version known as 'great knout' with metal weights on each tongue, notoriously used in imperial Russia.
In Moscow, a Court carbonadoes / His ignorant serfs with the knout; / […] / But Eton has crueller terrors / Than these,—in the Windsor Express.
Where it comes from
Via French knout from Russian кнут (knut), from Old East Slavic кнутъ (knutŭ), from Old Norse knútr (“knot in a cord”). Doublet of knot, node, and nodus.
Adapted from the Wiktionary entry knout (CC BY-SA 4.0).