A "no-fly zone" is an area in which aircraft are not permitted to fly. However, there are several synonyms for this term depending on the context in which it is used. For example, in military scenarios, it can be referred to as a no-fly area or a restricted airspace. In aviation terms, it can be called a temporary flight restriction or a controlled airspace. When used in the context of civil aviation, it can be referred to as an air exclusion zone or an air blockade. Regardless of the term used, the purpose of a no-fly zone is to prohibit aircraft from entering a designated area for safety or security reasons.