noun
message card; card with a written message
A card, often attached to a gift or bouquet, on which a personal message is written. Wasei-eigo; the English equivalent is usually 'gift card' or simply 'card'.
wasei-eigo (Japanese-coined English), from message card
花束にメッセージカードを添えた。
I attached a message card to the bouquet.
プレゼントに小さなメッセージカードを付けてください。
Please include a small message card with the present.