Glossary 325
Interconnection Diagram A diagram showing the cabling between electronic units, as well as how
the terminals are connected
Interior Elevation A straight-on view of the surface of the interior walls of a structure.
Internal Thread A thread on the inside of a member. Example: the thread inside a nut.
Isometric Drawing A form of a pictorial drawing in which the main lines are equal in dimension. Nor-
mally drawn using 30 degree, 90 degree angle.
Isometric Projection A set of three or more views of an object that appears rotated, giving the ap-
pearance of viewing the object from one corner. All lines are shown in their true length, but not all right an-
gles are shown as such.
Isometric Wiring Diagram A diagram showing the outline of a ship, an aircraft, or other structure,
and the location of equipment such as panels and connection boxes and cable runs.
Jamb The side portion of a door, window, or any opening.
Joist A horizontal beam used to support a ceiling.
Joist Hanger A metal connector for the end support of floor and ceiling joist.
Key A small wedge or rectangular piece of metal inserted in a slot or groove between a shaft and a
hub to prevent slippage.
Key Plan A plan, reduced in scale used for orientation purposes.
Keyseat A slot or groove into which the key fits.
Keyway A slot or groove within a cylindrical tube or pipe into which a key fitted into a key seat will slide.
King Stud A full-length stud placed at the end of a header.
Knee Wall A wall of less than full height.
Lattice A grille made by criss-crossing strips of material.
Lead The distance a screw thread advances one turn, measured parallel to the axis. On a single-
thread screw the lead and the pitch are identical; on a double-thread screw the lead is twice the pitch; on
a triple-thread screw the lead is three times the pitch.
Leader Line A thin line with an arrow head that is often positioned at an angle and is used to tie a
dimension, note or reference to a feature, especially when there are space limitations.
Ledger Structural framing member used to support ceiling and roof joists at the perimeter walls.
LEED Leadership in Energy and Environmental Design. A sustainable design building certification
system promulgated by the United States Green Building Council. Also an accrediting program for profes-
sionals (LEED APs) who have mastered the certification system. http://www.usgbc.org.
Legend A description of any special or unusual marks, symbols, or line connections used in the
drawing.
Lien A monetary claim on a property.
Limit of Liability The maximum amount which an insurance company agrees to pay in case of loss.
Lintel A load-bearing structural member supported at its ends. Usually located over a door or
window.
Live Load A temporary and changing load superimposed on structural components by the use and
occupancy of the building, not including the wind load, earthquake load, or dead load.
Load-bearing Wall A support wall that holds floor or roof loads in addition to its own weight.
Logic Diagram A type of schematic diagram using special symbols to show components that per-
form a logic or information processing function.
Major Diameter The largest diameter of an internal or external thread.
Manifold A fitting that has several inlets or outlets to carry liquids or gases.