I know what $10k means but what does the k mean?

k = kilo = 1,000.

kilo or kilogram

k=1000

ten thousand dollars, where K is the abbreviation for thousand

kilo = 1000 of something in the decimal system

kilo.

which means 1000

K = 1000. I hate questions that are so stupid like this.

K stand for kilo
Kilo means thousand
Like you know in kilometer, kilogram , kilolitre and all.