This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The modern form combines 土 (earth) with 彖, but the original meaning and component function are unclear.
The kanji has 土 (earth) on the left and a complex right side. Without a clear meaning, it is hard to build a reliable mnemonic.
For テン, imagine ten mounds of earth (土) shaped like the right component: ten -> テン, though the meaning is uncertain.