Game concept
Ceremonial Claimant Faction
The game also links it as Ceremonial Claimant Factions.
From the game's encyclopedia
The Claimant Faction seeks to install a particular Claimant as Ceremonial Monarch. If successful, the incumbent Ceremonial Liege will have to relinquish their Title to the Claimant. All Faction members will gain a Hook on the Claimant.
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.
Ceremonial Claimant Faction is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "The Claimant Faction seeks to install a particular Claimant as Ceremonial Monarch." It is part of Faction. The game also links it as Ceremonial Claimant Factions. 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.