The King of Hearts is the only king without a moustache in a standard deck of playing cards, which makes him stand out. This quirk, like the suicidal sword, is a result of design alterations over the centuries. The moustache removal was likely unintentional, caused by the simplification of facial features as card designs became mass-produced. The lack of a moustache has led to speculation that the King of Hearts represents a younger or more emotional ruler.