above
丄 centers on the concept of being above or on top, both physically and in abstract hierarchies.
丄 is an ancient variant of 上, using a short vertical stroke above a horizontal line to indicate the concept of 'above'.
The short vertical stroke sits above the horizontal line, like a mark pointing to something above.
For ジョウ, imagine a person named Joe standing above everyone else on a podium: Joe -> ジョウ, and he is above.