temple (of head)
顳 refers specifically to the temple region of the head, the flat area on the side of the forehead.
顳 combines 聶 (a component associated with whispering or the ear) and 頁 (head). The exact historical development is uncertain, but the combination likely points to the temple area near the ear on the head.
The left side 聶 contains three ears (耳 repeated), and the right side 頁 means head. Picture three ears crowded onto the side of a head, right where the temple is.
For ショウ, imagine a show being performed right on the temple of your head: show -> ショウ, and the temple is the stage.
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