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The world is a globe, or ball, just about perfectly round. Its diameter is about 8,000 miles, that's the one dimension you need.
Do you mean, like, the Earth? The equator. If you mean the line going from side to side across the middle of a circle then... the diameter of a circle
There are many. To name a few, there is "Earth," "Globe," etc.
One cookie take it with you as you fly around the world.
The answer is to use the metric system like the rest of the world.