Pen iron foot plate refers to

People who can write materials have a way to stick to the front line. Pen refers to a joke, which is about people who can write materials. Iron feet refer to feet or people who are good at walking, which is extended to the working method of going to the front line, being at the front line and sticking to the front line. Therefore, the iron foot refers to the working method that everyone who can write materials must stick to the front line. The pen container was called "miscellaneous pen" in ancient times, but it is called "minister" or "scholar" in modern times.