This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
檆 is a rare character combining 木 (tree) with 煔, but the exact historical development is uncertain.
The left side is a tree 木, and the right side 煔 looks like a fire 火 over a box 口 with a mark 卜. Picture a tree used for some kind of burning or marking, but the exact meaning is unclear.
For サン, imagine the sun (サン) shining on a mysterious tree: sun -> サン, and the tree 木 stands beside the obscure right side.