Why semi-trucks are called like that? What is so “semi” about them?

Is a semi-truck the front and back, or just the front? - Quora

Semi-trailer - Wikipedia

The truck of the future

Why Is a Tractor-Trailer Sometimes Called a 'Semi Truck'?

Why 18 Wheelers are called Semi Trucks

why left one is called semi-truck and right one is called truck when it should be the other way around. : r/CarsIndia

Volvo Trucks Introduces Vera, a Fully Autonomous Electric Semi Truck – GTPlanet

Tesla's electric Semi faces a long, slow, uphill climb

Here's Why Truck Trailers Are Called Semi-Trailers: COTD - The Autopian

Tesla Semi all-electric truck to be unveiled in September and be 'next level', says Elon Musk