What does GNC stand for?

Grand National Championship (ATV racing)

This definition appears very rarely and is found in the following Acronym Finder categories:

Organizations, NGOs, schools, universities, etc.
Slang/chat, popular culture

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Getting Needed Care (health scale) Ghana National Council (Chicago, IL) Global Navigation Chart GMF Network Controller GMFSC Network Controller Gobierno Nacional Central (Colombia) Good News Club (Child Evangelism Fellowship) Governance and Nominating Committee (corporate governance) Graduated Non-Convexity (image processing algorithm) Gram Negative Cocci (bacteria)		Graph-Node Coloring Greater Newark Conservancy Green National Committee Greenburgh Nature Center (Scarsdale, New York) Greg Norman Collection (golf) Groupement National Carpe (French: National Carpe Group; fishing association) Guidance and Navigation Computer Guidance, Navigation, and Control Gram-Negative Core Antigens Guyana National Cooperative Bank

Samples in periodicals archive:

1 Stock Cars racing in three heats, a consolation race for non-qualifiers from the heats, a 36-car Grand Final and a heat of the Grand National Championship, with the winner of the Grand Final handicapped by a full lap.

Speedway: Frankie out to spring back; Game On STOCK CARS

The Bands of America Grand National Championship is one of the largest high-school marching band competitions in the United States, with more than 80 bands competing over three days.

Yamaha at Grand National Championships. (Industry Forefront)

The Rochdale-based racer pulled back a 50-point deficit to snatch both the National Series title and Grand National Championship titles from Frankie Wainman Junior, who suffered a disastrous night's racing.

Athletics: Smith stuns Wainman to grab title double; STOCK CARS