M4

symbol for

the amount of money in circulation given by M1 plus most private-sector bank deposits and holdings of money-market instrumentsAlso called: PSL1

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for m4

He just stood up, looked over at the guy who was on the ground, pulled out his M4 and just pop pop.
‘Kill Team’: The Documentary the Army Doesn’t Want You to See|Andrew Romano|July 26, 2014|DAILY BEAST
"I spent a career carrying typically either a M16, and later a M4 carbine," he said.
The Gun Debate Heats Up|Michael Tomasky|January 8, 2013|DAILY BEAST
Brothern, "ye brothern" (M4,b), an old plural: cf. childern still in dialect use.
Early English Dramatists--Recently Recovered "Lost" Tudor Plays with some others|Various