numismatics \noo-miz-MAT-iks; -mis-; nyoo-\, noun:
the collection and study of money (and coins in particular).
I had no idea there was a “study” of money. I always thought: it was made, people spent it, it eventually got old, and then people collected it. My grandfather is a big coin collector, so I’ve seen my share of really intricate old coins, and I have to say it looks like a fun practice. I just didn’t know there was a study of money.