Game concept
Holding Type
The game also links it as Holding Types.
From the game's encyclopedia
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Holding Type is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "There are four types of Holdings: Castles, Cities, Tribes, and Temples." It is part of Holding. It covers Castle Holding, Temple Holding, City Holding, Tribal Holding, Temple Citadel Holding and 1 more. The game also links it as Holding Types. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.