Answers:
The letter K in this case is an abbreviation of the word kilo which means One thousand, thus 7k means seven thousand.
It's because kilo is the prefix for thousand in metric measurement. 'K' has been adopted as a shortcut/shorthand symbol for other times when thousands might be used.
K from the prefix Kilo meaning 1000 as in Kilogram. The prefix is from the greek.
It is short for kilo
yocto- y 10-24 * --
zepto- z 10-21 * --
atto- a 10-18 * --
femto- f 10-15 * --
pico- p 10-12 * --
nano- n 10-9 * --
micro- m 10-6 * --
milli- m 10-3 * --
centi- c 10-2 * --
deci- d 10-1 * --
(none) -- 100 20
deka- D 101 * --
hecto- h 102 * --
kilo- k or K ** 103 210
mega- M 106 220
giga- G 109 230
tera- T 1012 240
peta- P 1015 250
exa- E 1018 * 260
zetta- Z 1021 * 270
yotta- Y 1024 * 280
* Not generally used to express data speed
** k = 103 and K = 210
K represents the word kilo, which means 1000. Take a look at the link below to learn more about it.
cause k represents kilogram and its quite easy to use the first letter of kilogram to represent it.if it was filo gram, i guess the symbol would be f.
All the answerers except Junesta have answered the qestion correctly some more detailed than others. I have nothing to add.
They use K because kilo in Greek means 1000. (well, 'khilioi')
***Addition***also not much new!
K come from kilo, which means 1000, thus the usage
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