100000 is abbreviated as 100K. What does "K" stand for?

It comes from the Greek χίλιοι ("khilioi"), meaning thousand.

It derives from the prefix kilo, used in the metric system to mean a unit of one thousand, as in kilogram, kilometer, kilowatt, etc. When abbreviated it comes out as k, e.g. 5 kg, 5 km, 5 kw.

In computers K usually means 2^10 (two to the tenth power), or 1,024. That's close enough to 1,000 that most people just think of it as 1,000 -- and anyway, there's overhead used for system purposes so that you never really get 1,024 bytes of storage from 1,024 bytes of memory -- the 1,000 figure is pretty close.

Until recently M used to also mean 1,000, from Mill (also meaning 1,000, but in the metric system milo means 1/1000). But that got confusing because it's also an abbreviation for million. So today $1M usually means a million dollars, and $1B means a billion (a thousand million in the US at least, but it used to be a million million in the UK). Kind of confusing.

K stands for Kilo which is a measurement of one thousand.
for example, a kilogram is 1000grams, a kilometer is 1000meters...etc..

"K" is the roman numeral that means thousand.....just as "X" means ten and "V" means five and "I" means one.

Kilos which means thousand. Like a kilometer is 1000 meters.

100k Money

it stand for ****, which is greek for "your mother"

1000000000

Thousand

thousand

thousand

1 k is 1000 b
1 kilo byte is 1000 bytes
1 mega byte is 1000 kilo bytes
1 mega Wat is 1000 kilo WATS
you get the point