[=;161843]
Signed means they can be positive or negative. -500,000 to +500,000.
Yes but my point is that when measured, world have only about 500k uu total. So if we take from origin point it is only from about -250k to +250k.
Edit:
To check it out. Open Editor, open orthographic view. Zoom out until you can see entire grid, middle click and measure dimension of grid. Grid is allowed world size.