Objects we consider ordinary and useful become strange and obsolete as time goes by unless we pass down the knowledge of where each object came from and its intended use.
Let's start with the loop on the back of men's (and some women's) shirts- they're called locker loops, and they're thought to have originated with sailors, who would "hang their shirts on ship hooks while changing".
Nowadays they're rarely used for their intended purpose since we use hangers more than hooks, and some school kids even cut them off as a "fashion statement".
Next let's talk about that drawer under your oven, where most people store their baking pans and sheets.
Some ovens actually include this as a storage drawer, but this was originally a warming drawer- a place to (you guessed it!) keep food warm while the rest was still cooking.
Nowadays there are oven drawers for storage, others are used for warming, and a select few have a broiling pan down there that makes broiling a steak a breeze!
And speaking of cooking- did you know that little hole in the handle of your pot was made to be more than just a way to hang it on a hook?
Those little holes in the handle were originally included as both a hook loop and a place to park your spoon or spatula while cooking, so it wouldn't fall into the pot.
See The Forgotten Uses Of 8 Everyday Objects at mental_floss