1. In computer storage, k stands for 1024b.
2. In mathematical operations, it is sometimes expressed by the slope of a line segment.
3. In quantitative representation, it is generally believed that 1k is 1000 yuan.
Generally speaking, k means to fight and kill.
source
The letter k comes from the semitic letter Kap, which means open hand. The pronunciation of the letter K is kay, the phonetic symbol [kei].
Although Latin changed to the letter C and completely abandoned the letter K, the sound value /K/ of Semitic letters has remained in many classical and modern languages. So the Roman letter K is only used to spell foreign words.