What's the abbreviation for Reg? And Lg. At the bottom of the menu when traveling to America?

According to traditional restaurant language, Reg. Is the abbreviation of "Regular", which means regular or standard size or taste. And Lg. It's the abbreviation of "Large", which means a large size or a large amount of food or drink. Therefore, register. And Lg. The bottom of the menu usually indicates the size or quantity of food or drink. The specific name of food or drink needs to be determined according to the specific menu.