"Unit Vector - a vector 'normalized' so that it is within the distance range of 0.0 to 1.0.  Note the wordplay with 'normal' and 'normallized' - normals are normally normalized. ;P"

One slight correction here... a "normalized" vector has the distinctive property that it's distance (from 0/0/0) is exactly 1.0 (or should be).  So a normalized vector contains only direction information... this allows you to multiply it by some scalar value in order to produce a new point some exact distance from some other point, along some specific direction vector.

destination_point = origin_point + ( desired_distance * direction_vector )

...of course for the 'distance' of the vector to be 1.0 (no more, no less), then the 3 axis elements of the vector are in fact between 0.0 and 1.0 (I think that's what you meant).

BAR-CODE, the above is probably more than you cared to know, but if you understand what a Vertex Normal or a Face Normal is, it helps explain why and how some features of the modeller you use works.

Basically, when you see the word "Normal" in the menus somewhere in the modelling app, it's refering to the 'direction' that a polygon or vertex faces.  So if you extrude/move/scale something along it's normal, it extrudes/moves/scales along the direction it faces.

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