2011

handle A unique alphanumeric tag for an object in the program's database.
HDI For Heidi Device Interface. An interface for developing device drivers that are required
for peripherals to work with the program and other Autodesk products.
heads-up display (HUD) The process of transparently displaying user interface elements
on top of or over the drawing area without obscuring the view of the objects drawn on the
drawing area.
helix An open 2D or 3D spiral. (HELIX)
Help menu The legacy way to access online Help. In the current version of AutoCAD, you
can find Help on the InfoCenter toolbar or by pressing F1.
HLS For hue, lightness, and saturation. A system of defining color by specifying the amount
of hue, lightness, and saturation.
Home view A special view saved with the drawing that is controlled through the ViewCube
tool. The Home view is similar in concept to the default, initial view presented when a
drawing is first opened.
horizontal landing An optional line segment connecting the tail of a leader line with the
leader content.
horizontal ribbon
The ribbon, when it is oriented across the top of the file window.
i-drop A method by which a drawing file can be dragged from a Web page and inserted
into another drawing.
IGES For Initial Graphics Exchange Specification. A standard format for digital representation
and exchange of information between CAD/CAM systems. In AutoCAD-based products, the
commands to import and export IGES files are available only in AutoCAD Mechanical.
Illuminance In photometry, illuminance is the total luminous flux incident on a surface
per unit area.
indirect bump scale Scales the effect of the base material’s bump mapping in areas lit by
indirect light.
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