Game concept
Cultural Fascination
The game also links it as Fascination.
From the game's encyclopedia
Each Culture is always Fascinated by a specific Innovation, which greatly increases the speed of discovery at a rate depending on the Skills of the current Culture Head. Each Innovation benefits from a specific Skill.
The Cultural Head can change the Cultural Fascination freely.
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.
Cultural Fascination is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Each Culture is always Fascinated by a specific Innovation, which greatly increases the speed of discovery at a rate depending on the Skills of the current Culture Head." The game also links it as Fascination. 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.