opening card

noun
UK /ˈəʊpənɪŋ kɑːd/
US /ˈoʊpənɪŋ kɑːrd/

A card you open to see a message or picture inside.

She gave me an opening card with a funny joke inside.


OTHER MEANINGS

2. The first card played in a card game.

He laid down his opening card and the game began.

3. A card used to start or announce an event.

The opening card for the show listed all the performers.

4. A promotional card that introduces a product or offer.

The store handed out an opening card for its grand sale.