Denoted by the letter Z—a reference to the equivalent nautical time zone (GMT), which has been denoted by a Z since about 1950. The letter also refers to the “zone description” of zero hours, which has been used since 1920 (see time zone history). Since the NATO phonetic alphabet and amateur radio word for Z is “Zulu”, UTC is sometimes known as Zulu time. This is especially true in aviation, where Zulu is the universal standard. This ensures all pilots regardless of location are using the same 24-hour clock, thus avoiding confusion when flying between time zones. More about coordinated universal time on Wikipedia.
I have found us a collection of nice Zulu wall clocks, the all black 14″ is gonna look really good in my home office above the giant iMac.
Black Plastic Frame. Clear Plastic Lens. Dimensions:14″ diameter, 2″ depth, Separate hands indicate12 and 24 hr time.