A cuirass is a piece of armor, designed to protect the torso; it is also called a “breastplate” for that reason. It’s found in the arms of Balbirny of that Ilk, 1542 [Lindsay], possibly as a cant on “byrnie”, or mail hauberk. The cuirass is affronty by default. For related charges, see jerkin, mail.
Khalid al-Khadir bears: Sable, a cuirass and on a chief argent, in sinister a decrescent azure.
Richard Devlin Bordeaux bears: Gules, a breastplate argent, a point pointed and on a chief Or three gunstones.