From Rise: The Vieneo Province - The Space Simulator MMO from Unistellar Industries, LLC
A method of determining position.
A 1 dimensional coordinate can be thought of as 10 centimeters in on a ruler.
2 dimensional example is take a piece of paper measure in 15 cm and up 20 cm.
To add the 3rd dimension just hold you pencil 5 cm above the page.