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Nissan has filed trademark applications in the US and Canada for "I-Power". It likely stands for "Intelligent Power" that they have been using as of late and this description in the application gives of an idea of what it could be:
For: Electric drive unit for land vehicles; bodies for vehicles; automobile chassis; transmissions for land vehicles; steering wheels for automobiles; automobiles and their parts and fittings; automobiles; electric vehicles and their parts and fittings; fuel cell vehicles and their parts and fittings; AC motors and DC motors for land vehicles; mechanical elements for land vehicles; shafts, axles or spindles for land vehicles; bearings for land vehicles; shaft couplings or connectors for land vehicles; axle bearings for land vehicles; power transmissions and gearing for land vehicles; shock absorbers for land vehicles; springs for land vehicles; brakes for land vehicles; driving motors for land vehicles; hybrid system for automobile, trucks, vans, sport utility vehicles, motor buses, recreational vehicles (RV), sports cars, racing cars; electric automobiles; hubs for vehicle wheels; vehicle wheels; propulsion mechanisms for land vehicles