This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 帇 is uncertain. It visually contains 巾 (cloth) and a top element, but the original meaning and component relationships are unclear.
The shape suggests a cloth 巾 with something above it, but no clear meaning emerges. Treat it as an obscure character.
For デン, imagine a den of old cloth where this rare character might be found: den -> デン, though the meaning remains uncertain.