M1

noun4

1. •
   The amount of cash in circulation plus the amount in bank accounts.
2. •
   Apple M1, a system on a chip designed by Apple which was introduced in 2020.
3. •
   A semi-automatic rifle that was the service rifle of the U.S. Army during World War II and the Korean War.
4. •
   The number two, as the first Mersenne prime.