This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
瞾 is a rare character composed of 䀠 (two eyes) over 空 (empty/sky). Its exact historical origin is uncertain, and it may be a variant or coined form.
Two eyes 䀠 looking into an empty sky 空, perhaps suggesting a gaze into the void or a watchful emptiness.
For ショウ, imagine two eyes staring into an empty sky, and a show of light suddenly appears: show -> ショウ.