"KOAR" can refer to several things, most commonly the Keweenaw Overland Adventure Retreat (an off-roading/camping event in Michigan's UP) or KOAR, LLC, a real estate investment firm, but also a Christian radio station (KOAR-FM) or even a fantasy deity. The context of where you see "KOAR" determines which entity it is, with the adventure retreat being a popular, active community event. 
Here's a breakdown:
Keweenaw Overland Adventure Retreat (KOAR): An annual event for overlanding enthusiasts in Michigan's Keweenaw Peninsula, featuring off-road exploration, camping, workshops, and community.
KOAR, LLC: A US real estate company focused on acquiring, developing, and managing properties, particularly industrial, self-storage, and mixed-use.
KOAR-FM: A contemporary Christian radio station in Searcy, Arkansas, part of the Air 1 network.
Koar (Mythology): In the GemStone IV MUD, Koar is the King of the Gods, ruling the Arkati. 
If you're seeing it online, it's likely the popular adventure retreat or the real estate firm; for radio, it's the station; and in gaming, the deity. 
Buy Tickets and see more: https://northologyadventures.com/event/koar-2026-keweenaw-overland-adventure-retreat/