Game concept

County Modifier

The game also links it as County Modifiers.

From the game's encyclopedia

County Modifiers are modifiers that affect a County's various values.

Baronies can have modifiers of their own, and they can be viewed in the Holdings of the County.

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.

County Modifier is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "County Modifiers are modifiers that affect a County's various values." It is part of Modifier. The game also links it as County Modifiers. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.

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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.