racecar

a car used for racing

I drove a racecar on the racing track

arsenal

a collection of weapons e.g. guns ammo grenades or armor

An arsenal of weapons

3.141592653589793238

18 digits of pi

3.141592653589793238 is pie

sexdecillion

a number followed by 51 zeros

a sexdecillion years

3.141592653589793238462643383279502884197169399375105820974944

pi

I tried to remember 3.141592653589793238462643383279502884197169399375105820974944 is pi

quattourdecillion

a number followed by 45 zeros

75 quattourdecillion