While "Morning Star" can refer to Satan, it's also the name of a type of spiked mace derived from the Medieval period (and vastly used in RPGs and MMORPGs today). A
morning star's like a mace, except that
maces only have a blunt, crushing head; while
morning stars are the variants that have a sharp cluster of metal spikes to add to the smashing power. Many people confuse these to be maces, whereas maces are only ever *blunt*.
Another common understanding of maces is with regards to the "ball-and-chain", where a morning star's spiked head (sometimes left blunt) is swung around on a chain or rope. These are actually called "flails", not maces.