Why is it called a marker pen?

1. It was invented by Americans in 1953. It was originally used as a marker, so it is called "marker" or "markerpen". The transliteration is "marker pen". It has been in China for about 20 years.

2. The name marker pen is transliterated from English. Also known as a marker pen, it is a colored drawing pen specially used for writing or painting. It contains ink itself and usually has a pen cap attached. It usually has a hard tip. Its pigments are volatile and can be used for one-time quick drawings. They are often used in designing items, advertising slogans, posters or other artistic creations.