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tooltip
A small box of text that identifies or explains an object or interface element
when the cursor hovers near or over it.
tracking
A way to locate a point relative to other points on the drawing.
transparent command
A command started while another is in progress. Precede transparent
commands with an apostrophe.
UCS
See user coordinate system (UCS).
UCS definition
Each UCS definition can have its own origin and X, Y, and Z axes. Create and
save as many UCS definitions as you need.
UCS icon
An icon that indicates the orientation of the UCS axes. (UCSICON)
underconstrained geometry
Objects with unsolved degrees of freedom are underconstrained.
up direction
A vector defining what direction is Up. By default this is the positive Z – axis
(0,0,+1).
The up direction and the north direction are always constrained such that
they are perpendicular to each other.
user coordinate system (UCS)
The active coordinate system that establishes the XY plane (work plane) and
Z-axis direction for drawing and modeling. You can set the UCS origin and
its X, Y, and Z axes to suit your needs. See also world coordinate system (WCS).
550 | Glossary
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