muleta
A red flag used by bullfighters.
Out in the center of the ring Romero profiled in front of the bull, drew the sword out from the folds of the muleta, rose on his toes, and sighted along the blade.
Where it comes from
Borrowed from Spanish muleta, diminutive of mula (“mule”).
Adapted from the Wiktionary entry muleta (CC BY-SA 4.0).