2.5 million???? I assume you meant $2.5K or $2500.
Per Wikipedia:
M, the Roman numeral for 1000, is often used in symbols to indicate a thousand, as in Mcf, a traditional symbol for 1000 cubic feet. Given the widespread use of M to mean one million, this older use of M to mean 1000 is very confusing and should be scrapped.
(But it has not.)
It still shows up on my natural gas bill every month. I do not use a million cubic feet of natural gas in a month. (And I do not sue my gas provider for overcharging for 1,000 times more gas than I burned.) Sorry, I am old.
Apparently, when I was your age, M was used for thousand. (Was based on the metric system). And that was so long ago the term "million" had not been invented yet? Ever hear of the board game “Mille bornes”? Mille Bornes. (French for a thousand milestones, referring to the stone distance markers on many French roads) is a French card game.
In the United States, Mille Bornes is manufactured and distributed by Winning Moves Games under license from Hasbro. It was previously produced by Parker Brothers[1] and is commonly available in stores that sell games. Mille Bornes is listed in the GAMES Magazine Hall of Fame.
My 2.5M meant 2.5 thousand. Sorry, it is you newcomers’ fault the language has changed. I will not bother to learn your lingo, just as I will not learn to speak Chinese, or muslim-speak. I took a Spanish course back in 1964, because I had to to progress toward my degree, but I will ignore the metric system as long as I live, because the stupid Europeans you want to imitate debase their numbers by factors of 1,000 every few years.