The letter "K" is used to represent 1000, because it represents the prefix "kilo," which means 1000 of something in the metric system. For instance, kilogram means 1000 grams.
The prefix "kilo" was taken from the Greek word chilioi or khilioi, which means thousand. This happened when a group of French scientists were commissioned to make the metric system. The metric system was designed to make conversions between units easier by making each unit a factor of 10 larger or smaller than the nearest units. Scientists needed to have standard prefixes that represented how much larger or smaller a specific unit was from the base unit. This makes it easy for a kilometer to be converted to a meter or a kilogram to a gram, because once the prefixes are known all conversions are standard.Learn More
According to the Encyclopedia Britannica, in the metric system the prefix "milli" is used to designate one-thousandth of a unit. A common example would be a millimeter, which is equal to one-thousandth of a meter.Full Answer >
When newspaper journalist Henry Chadwick created the baseball recordkeeping system, he used the letter "K" to denote "strikeout" because he needed the letter "S" to communicate "sacrifice." He chose "K" because it was the last letter of the word "struck," a term which was more commonly used than strikeout in the early days of baseball.Full Answer >
The backwards "K" is used to represent a strikeout when the batter does not swing at the final strike, used to differentiate between types of outs. The batter is considered to have "been caught looking," instead of swinging the bat at the final pitch of an at-bat.Full Answer >
The two major systems of measurement in use in the world are the U.S. Customary System of measurement and the International System of Units, commonly known as the metric system. The majority of the world uses the metric measuring system.Full Answer >