This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
僢 combines 亻 (person) with 舜, which likely contributes the sound. The exact historical development is uncertain, and the character is rare.
A person 亻 beside 舜, a rare shape associated with a legendary ruler. Since the meaning is unclear, picture a person standing next to an ancient emblem, their purpose lost to time.
For セン, imagine a person 亻 sending a message to the legendary 舜: send -> セン, though the message's content is forgotten.