This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
曌 is a rare character whose exact historical development is uncertain. It visually combines 明 (bright) and 空 (sky/empty), but its original purpose and formation are unclear.
The top 明 suggests brightness, and the bottom 空 suggests the sky. Together they might evoke a bright, empty sky, but the meaning is uncertain.
For ショウ, imagine a bright sky at a show: show -> ショウ, with 明 and 空 combining like a stage set.