Codes are systems of signs or symbols used to communicate meaning, while conventions are the commonly accepted meanings created by those codes. Some examples of codes and their related conventions include a red traffic light meaning stop, a heart meaning love, and tears meaning sadness. The abbreviation "lol" is a code that by convention means "laugh out loud." Codes and conventions are culturally specific and depend on context, such as a heart in a medical book referring to anatomy versus a heart in a romance novel referring to love. Technical and symbolic codes also help establish conventions in film.