Game concept · All Under Heaven
Silk Road Innovation
The game also links it as Silk Road Innovations, Silk Road.
From the game's encyclopedia
Silk Road Innovations are Innovations that spread westwards along the Silk Road.
Cultures with the Sinophilic Tradition have access to all Silk Road Innovations discovered by the Han Culture.
Rulers outside the Silk Road can attempt to bring knowledge back to their Culture via the Visit a Silk Road Market Decision. If successful, the Silk Road Innovation can be discovered like any other Innovation once they return.
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.
Silk Road Innovation is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "Silk Road Innovations are Innovations that spread westwards along the Silk Road." The game also links it as Silk Road Innovations and Silk Road. 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.