2011

Table Of Contents
lineweight A width value that can be assigned to all graphical objects except
TrueType
®
fonts and raster images.
LL84 coordinate system Common latitude longitudinal-based coordinate
system where latitude and longitude are both measured from -90 to 90 degrees.
Longitude begins at 0 degrees at the Prime Meridian in Greenwich, England
and is measured from -180 to 180.
Latitude is 0 degrees at the equator and is measured from -90 to 90.
lofted solid/surface A solid or surface that is drawn through a set of two or
more cross-section curves. The cross sections define the profile (shape) of the
resulting solid or surface. Cross sections (generally, curves or lines) can be
open or closed. (LOFT)
lumen The SI unit of luminous flux (Symbol: lm). Cd * Sr
luminaire This refers to the aggregation of a lamp or lamps and its fixture.
The fixture may be a simple can or a complex armature with constrained
joints.
luminance Luminance is the value of light reflected off a surface. It is a
measure of how bright or dark we perceive the surface.
luminous flux The perceived power in per unit of solid angle. The total
luminous flux for a lamp is the perceived power emitted in all directions.
lux The SI unit of illuminance (symbol: lx). Lm/m^2
main customization file A writable CUI file that defines most of the user
interface elements (including the pull-down menus and tool sets).
merge In tables, an adjacent cell selection that has been combined into a
single cell.
mesh A tessellated, or subdivided object type that is defined by faces, edges,
and vertices. Mesh can be smoothed to achieve a more rounded appearance
and creased to introduce ridges. Before AutoCAD 2010, only the less modifiable
polygon and polyface mesh was available.
mirror To create a new version of an existing object by reflecting it
symmetrically with respect to a prescribed line or plane. (MIRROR)
mode A software setting or operating state.
model A two- or three-dimensional representation of an object.
model space One of the two primary spaces in which objects reside. Typically,
a geometric model is placed in a three-dimensional coordinate space called
1022 | Glossary