I love the word 'subitize' because it sounds so formal for such an easy skill-- to be able to know the quantity just by looking briefly at a pattern.
So, when you roll a die, and you see a dot in each corner and one in the middle, you know by the pattern that it's the number five. ⚄ You have just successfully subitized!
Congratulations to all you subitizers out there who didn't know you held that title!