キープレート

noun

key plate (printing)

In printing, the plate that carries the most detail, usually the black plate, used as a guide for registering other colors.

• カラー印いん刷さつでは、キープレートを基き準じゅんに他ほかの色いろを合あわせます。

  In color printing, other colors are aligned based on the key plate.

noun

key tag; label holder for a key ring

A small plastic or metal tag attached to a key ring, often used to write the key's purpose or room number.

• 合あい鍵かぎにキープレートを付つけて、どこの鍵かぎかわかるようにした。

  I attached a key tag to the spare key so I can tell which key it is.