A common internet and twitter shorthand for Microsoft is MS.

Not-so-Microsoft friendly people use “M$”

I just have a good laugh. I remember the days when one used the dollar-sign to denote the variable as a string type:

M$ = "Microsoft"

or in other words, the variable M is a string of value “Microsoft”

Thankfully, most modern languages (even those from Microsoft) no longer use this programming language mnemonic (or what is formally known as postfix sigils)

I LOL AT UR L4M3 POSTFIX SIGIL