Game concept · All Under Heaven
Personal Movement Power
The game also links it as Power.
From the game's encyclopedia
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.
Personal Movement Power is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "Personal Movement Power is how much a member increases the overall Power of their Movement" It is part of Movement Power. The game also links it as Power. 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.