A world clock, often called a "Worldtime Clock", is a clock which displays the time for various cities around the world.
The World clock time can take various forms:
The world clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric readouts, with each clock being labelled with the name of a major city or time zone in the world.
It could also be a worldclocksite of the world with embedded analog or digital time-displays.
A moving circular map of the world, rotating inside a stationary 24 hour dial ring. Alternatively, the disc can be stationary and the ring moving.
There are also world time watches, both wrist watches and pocket watches. Sometime manufacturers of timekeepers erroneously apply the worldtime label to instruments that merely indicate time for two or a few time zones.