In English, we often give nicknames or "pet names" to people we are close with, including our teachers. This can be a way to show affection or create a friendly atmosphere in the classroom. Some examples of nicknames that a teacher might be given by their students include "Mr. (or Mrs., Miss, Ms.) [Last Name]" (using a shortened version of their last name), "Coach," or simply a shortened version of their first name. It is important to remember that nicknames should always be given with respect and should not be used to make fun of or disrespect the person.