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Glossary of Terms

IC

(abb.) Interchangeable Core
Source: Lock Industry Standards and Training (LIST) Council

ICBO

(abb.) International Conference of Building Officials
Source: Lock Industry Standards and Training (LIST) Council

Ignition Key Release

(n.) A button or other actuator which must be pushed before a vehicle's ignition key may be turned to the withdrawal position.
Source: Lock Industry Standards and Training (LIST) Council

Ignition Lock

(n.) The lock assembly associated with a vehicle's engine on off switch and starter.
Source: Lock Industry Standards and Training (LIST) Council

Ignition Puller

(n.) A tool for removing an ignition cylinder by pulling outward on it.
Source: Lock Industry Standards and Training (LIST) Council

ILA

(abb.) Institutional Locksmiths Association
Source: Lock Industry Standards and Training (LIST) Council

ILCP

(abb.) "Institutional Locksmith Certification Program"; a locksmith certification program administered by ILA.
Source: Lock Industry Standards and Training (LIST) Council

Impression

(n.) 1. The mark made by a tumbler on its key cut.
(v.) 2. To fit a key by the impression technique.
Source: Lock Industry Standards and Training (LIST) Council

Impression Technique

(n.) A means of fitting a key directly to a locked cylinder by manipulating a blank in the keyway and cutting the blank where the tumblers have made marks.
Source: Lock Industry Standards and Training (LIST) Council

Impressioning Tool

(n.) 1. A tool designed to hold a key blank while making a key by the impression method.
(n.) 2. A tool which fits into a keyway and holds a material that accepts impression marks easily.
Source: Lock Industry Standards and Training (LIST) Council

Inactive Case

(n.) The exit device case mounted on the stile opposite the lock stile.
Source: Lock Industry Standards and Training (LIST) Council

Inactive Door

(n.) The door of a pair, which is secondary in usage and is normally locked by surface or flush bolts.
Source: Lock Industry Standards and Training (LIST) Council

Incidental Master Key

(n.) A key cut to an unplanned shear line created when the cylinder is combinated to the top master key and a change key.
Source: Lock Industry Standards and Training (LIST) Council

Increment

(n.) A usually uniform increase or decrease in the successive depths of a key cut which must be matched by a corresponding change in the tumblers.
Source: Lock Industry Standards and Training (LIST) Council

Independent Custody

(n.) 1. A function of a locking mechanism that allows separate access by either of two different people, each with a different type method of opening and closing the lock.
(adj.) 2. Pertaining to such a function.
Source: Lock Industry Standards and Training (LIST) Council

Index (Of A Combination Lock Dial)

(n.) The mark outside the dial ring of a combination lock used as a reference point.
Source: Lock Industry Standards and Training (LIST) Council

Indicator

(n.) A device which provides visual evidence that a deadbolt is extended or that a lock is in the shut out mode.
Source: Lock Industry Standards and Training (LIST) Council

Individual Key

(n.) An operating key for a lock or cylinder which is not part of a keying system.
Source: Lock Industry Standards and Training (LIST) Council

Inner Ring

(n.) That part of a mesh change or key change combination wheel that makes direct contact with the wheel post.
Source: Lock Industry Standards and Training (LIST) Council

Integral Lockset

(n.) A lockset that combines two or more different mounting or operational methods, typically key-in-knob and mortise.
Source: Lock Industry Standards and Training (LIST) Council

Interchangeable Core

(n.) A key removable core which can be used in all or most of the core manufacturer's product line. No tools (other than the control key) are required for removal of the core.
Source: Lock Industry Standards and Training (LIST) Council

Interconnected Lockset

(n.) A lockset whose trim provides a means of simultaneous retraction of two or more bolts which may also be operated independently.
Source: Lock Industry Standards and Training (LIST) Council

Interlocking Bolt

(n.) A bolt which interlocks with its strike when fully engaged.
Source: Lock Industry Standards and Training (LIST) Council

Interlocking Pin Tumbler

(n.) A type of pin tumbler which is designed to be linked together with all other tumblers in its chamber when the cylinder plug is in the locked position.
Source: Lock Industry Standards and Training (LIST) Council

Intermittent Duty

(adj.) Of or pertaining to an electric strike or lock not designed to be energized for extended periods of time.
Source: Lock Industry Standards and Training (LIST) Council

Internal Relocking Device

(n.) A device inside a safe lock case that prevents the lock bolt from being retracted after attack.
Source: Lock Industry Standards and Training (LIST) Council

IP

(abb.) Internet Protocol
Source: Lock Industry Standards and Training (LIST) Council

IR

(abb.) Infrared
Source: Lock Industry Standards and Training (LIST) Council

IRD

(abb.) Internal Relocking Device
Source: Lock Industry Standards and Training (LIST) Council