This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The historical origin of 厽 is uncertain. It appears to be a compound of 厶 repeated, but its development is not well documented.
The character looks like a doubled 厶, but its meaning is unclear. Think of it as a mysterious ancient symbol whose meaning has been lost.
For ルイ, imagine a ruined wall (かべ) with the sound 'rui' echoing as it crumbles: rui -> ルイ, and the wall is the only known meaning.