Portals - Portal Wiki

the Wiki Portal for Five Nights at Freddy's Plus says its a Five Nights at Candy's Portal : r/fivenightsatfreddys

Portals -- Aavegotchi Wiki

Handheld Portal Device - Portal Wiki

Prestige Portal - Big Time Wiki

Portal (Personal Story) - Guild Wars 2 Wiki (GW2W)

Portals - Portal Wiki

Portal (Object) - Zelda Wiki

Anti portals - Unreal Wiki

Twilight Portal - Zelda Dungeon Wiki, a The Legend of Zelda wiki

Chell - Portal Wiki