Narrow Money

Wasn’t that Nicki Minaj's label before she got her implants?

In financial terms, think of it as money, narrowly defined. Basically, it’s the physical forms of money...the kind you can carry in your pocket. We’re talking bills and coins, as well as a few kind kinds of bank deposits.

It stands opposed to broad money, which includes other items that can feed into a country's money supply. Broad money includes things like funds in bank accounts and other items that people can use to buy stuff.