Game concept · All Under Heaven
Divergent Bloc Member House
The game also links it as Divergent Bloc Member Houses, Divergent Bloc House, Divergent Bloc Houses.
From the game's encyclopedia
A Divergent Bloc Member House is a House that has joined a House Bloc, but a different House Aspirations as the Leading House.
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.
Divergent Bloc Member House is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "A Divergent Bloc Member House is a House that has joined a House Bloc, but a different House Aspirations as the Leading House." It is part of Bloc Member House. The game also links it as Divergent Bloc Member Houses, Divergent Bloc House and Divergent Bloc Houses. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/tgp_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.