IFF- Identification friend or foe.

INITIAL VELOCITY (IV)- The speed at which a projectile is traveling at the instant it leaves the gun bore.

IPB- Illustrated parts breakdown is a publication that describes and illustrates all the components used in ordnance equipment.

LED- Light-emitting diode.

LIFT- The upward force that supports the missile in flight.

LOF- Line of fire is used to position the gun bore with respect to the LOS.

LOS- Line of sight is used to establish the present location of the target.

LOW-PRESSURE (LP) AIR- Pneumatic air pressure ranging up to 150 psi.

MACH NUMBER- The ratio of missile speed to the local speed of sound.

MAGAZINE AREA- The compartment, spaces, or passages on board ship containing magazine entrances that are intended to be used for the handling and passing of ammunition.

MAGAZINE- Any compartment, space, or locker that is used, or intended to be used, for the stowage of explosives or ammunition of any kind.

MAIN RELIEF VALVE- Protects the CAB unit from excessive pressure buildup and cavitation of the A-end.

MASTER REFERENCE PLANE (MRP)- The plane used as the machining reference to establish the foundation of the combat systems equipment. After initial construction, the MRP is only used as a reference plane following major damage or modernization.

MAXIMUM EFFECTIVE RANGE- The greatest distance at which a weapon maybe expected to fire accurately to inflict damage or casualties.

MAXIMUM RANGE- The greatest distance that the projectile will travel.

MCC- Main control console.

MEDIUM PRESSURE (MP) AIR- Pneumatic air pressure ranging from 151 to 1,000 psi.

MFCS- Missile fire control system.

MHE- Materials-handling equipment (industrial).

MODIFIED DOUBLE WEDGE- A supersonic fin shape that has relatively drag and is stronger.

MRC- Maintenance requirement cards.

NALC- Navy ammunition logistics code.

NEC- Navy enlisted classification code.

NEEW- The Net Equivalent Explosive Weight.

NPN- A transistor with the arrow that points away from the base.

NTDS- Naval tactical data system.

NWS- Naval Weapons Station.

OFFSET CENTER-LINE REFERENCE MARKS-

Established during initial instruction to facilitate combat systems alignment. They are installed to prevent repeating center-line surveys during subsequent alignments.

OGIVE- The forward portion of a projectile.

OJT- On-the-job training.

ORDALTS- Authorized ordnance alterations.

ORTS- Operational readiness test system.

OSG- Order signal generator.

PA- System operating pressure ranging from 1,400 to 1,700 psi.

PC- Printed circuit card.

PDP- Power distribution panel.

PITCH- The turning rotation of a missile about its lateral axis.

PNP- A transistor with the arrow that points towards the base.

POWER OFF BRAKE- ^{Stops the equipment} movement during power failures, secures equipment movement against pitch and roll of the ship when system is inactive, provides for manual hand cranking during emergencies, installation, and maintenance.

PQS- Personnel qualification standards.

PREVENTIVE MAINTENANCE- The regular lubrication, inspection, and cleaning of equipment.

PRIMARY MAGAZINES- Ammunition stowage spaces, generally located below the main deck, and insofar as is practical, below the waterline.

PRIMERS- A device used to initiate the burning of a propellant charge by means of a flame.

PROPELLANTS- A device used to provide a pressure that, acting against an object to be propelled, will accelerate the object to the required velocity.

PRP- Pneumatically released pilot valve.

PYROTECHNIC- A device used for illumination, marking, and signaling.