The "Bullet Proof"

"Secrets of the Shining Knight". A team of researchers test a reproduction of a late-16th century plate cuirass forged by the Royal Greenwich Workshop for Lord William Compton, Earl of Northampton, against a matchlock musket. The breastplate's placard easily withstands the bullet at a range of less than ten meters. Such a shot was historically used to prove a suit of plate would withstand a bullet, hence the term "bulletproof".

Example of:
Bulletproof Vest