There Are So Many Things We Take For Granted,

that we do not know the names of, 

for myself a few items, number 3, it seems silly to say it, but I have often wondered what it is called, and with the number I have opened number 11, as for my writing, number 17, so now I know!

found on Swiss Miss, although one commentator stated that number 20 is wrong—it’s a Brannock device, and they were correct! 

you can actually buy one here.