Nameplate: The plate on the outside of the motor describing the motor, HP, voltage, RPM's, efficiency, design, enclosure, etc.

 
Navy Service "A": Motors designed to meet requirements of MIL M-17059 or MlL M-17060 for high shock and service and are essential to the combat effectiveness of a ship. These motors are usually made of nodular iron.

 
N.E.C. Temperature Code: An index for describing maximum allowable "skin" (surface) temperature of a motor under any normal or abnormal operating conditions. The "T" codes are applicable to U.L. Iisted explosion-proof motors. The skin temperature shall not exceed the minimum ignition temperature of the substances to be found in the hazardous location. The "T" code designations apply to motors and other types of electrical equipment subject to hazardous location classification.

NEMA: The National Electrical Manufacturers Association (http://www.nema.org) is a non-profit organization organized and supported by manufacturers of electric equipment and supplies. NEMA has set standards on:

Horsepower Ratings

Speeds

Frame sizes and dimensions

Standard voltages and frequencies with allowable variations

Service factors

Torques

Starting current & KVA

Enclosures

NEMA Premium: See this link