Official world time can be referred to in various ways. One of the most commonly used synonyms is Coordinated Universal Time (UTC). This is the international standard for timekeeping and is based on the Earth's rotation around the sun. Other synonyms for official world time include Greenwich Mean Time (GMT), Zulu Time (Z), and Universal Time (UT). These terms are often used in military and aviation contexts where precise and accurate timekeeping is critical. The use of these synonyms ensures that everyone is on the same page and that there is no confusion when coordinating events and activities across different time zones.