Why is 1 thousand called 1K?

The origin of the letter "K" comes from the word "kilo" in the International System of Units (SI). "Kilo" comes from the Greek word (khilioi), meaning "one thousand".

In the SI system of measurement, prefixes such as kilo-, mega-, giga- are used to denote multiples of 10. For example, a kilometer (km) is one thousand meters, a kilogram (kg) is one thousand grams, and a kiloliter (kl) is one thousand liters. The use of the letter "K" to denote the number 1 thousand in contexts other than the metric system also originates from this.

The letter "K" is widely used in many different fields. In finance and business, "K" is often used to represent amounts or quantities in thousands. For example, 5K means 5 thousand units of currency. In technology and computer science , "K" is also used to represent large quantities, for example, a 10KB (kilobyte) file is 10 thousand bytes in size. On social media platforms, the letter "K" is often used to represent the number of followers, likes, or views, for example, 20K followers means 20 thousand followers.

Illustration: yeah1.com

Using the letter "K" has many advantages. It is convenient and concise, saving space and time when writing or reading large numbers. Instead of writing "1,000" or "one thousand", you can just write "1K", which is easier and faster.

The letter "K" is also an international symbol, recognized and widely used around the world , which helps avoid confusion when communicating in international contexts or with foreigners.

Finally, in many cases, using the letter "K" helps to represent exact quantities without the need for a comma or period to separate thousands.

The letter "K" is not only used in finance and technology but also in other fields. In sports , such as running, the letter "K" is used to denote distance, for example a 5K race means a race of 5 thousand meters...

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Source: https://vtcnews.vn/tai-sao-goi-1-nghin-la-1k-ar911795.html