Simplified English
The rules say to only use the words in simplified English in approved ways. This decreases misunderstanding. For example, the rules approve the use of the verb close ("Do not close the door"). The rules approve the use of the adjective closed, meaning "not open" ("The door is not closed"). The adjective close means near ("Do not go close to the door"). The rules disapprove the use of the adjective close. The rules approve the use of the adjective near ("Do not go near the door") for this meaning. The rules specify the use of the adjective near instead of the adjective close. This way, the reader can be sure if the instructions say to keep the door open or to stay far from the door.