reply card

noun

1. a usually postage-paid postcard or coupon that can be mailed back to the sender to place an order, request information, or the like.

Example Sentences

In its issue for 30th May, 1896, the Monthly Journal chronicles the receipt of the reply card in black on a very smooth buff card.

From Project Gutenberg

These were the reply card and the Postal Union card in a change of color.

From Project Gutenberg