I was reading in Blender 3d : Noob to pro - Page: The Buttons Window
And there is one thing i didnt understand in it :
" The grid lines represent one Blender Unit (BU). How big is a BU? It can be however large you would like it to be! A BU could be an inch, a centimeter, a mile, or a cubit. A BU lets you decide the scale. "
Will you explane a little more about Bu .