Game concept
Court Position Task
The game also links it as Court Position Tasks, Task, Tasks.
From the game's encyclopedia
Some Court Positions can perform an additional task, often giving more benefits at an extra cost.
Only one task can be active at a time per Court Position.
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.
Court Position Task is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Some Court Positions can perform an additional task, often giving more benefits at an extra cost." It is part of Court Position. The game also links it as Court Position Tasks, Task and Tasks. Patch 1.20.1.2, from game/common/game_concepts/06_ce1_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/06_ce1_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.