One of my favorite pop-culture samurai helmet stories involves Super Mario Odyssey. In Bowser's Kingdom (modelled after a feudal Japanese castle), Mario can buy a samurai outfit set, of which the helmet has antlers and six Mario coins in front.
It turns out to have been modelled after the samurai armor of the Sanada clan, whose battle-crest was the rokumonsen, or six mon coins. The Japanese at the time had a Greek-like burial practice of burying coins with their dead so their spirits can pay passage to the afterlife -- one coin to pass through each of the six Buddhist afterlife realms to get to heaven. So when the Sanada clan rode into your territory and you saw that six-coin crest, the message was: death is coming for you.