noun
red tag; red label
Typically a red tag attached to sold or discounted goods in shops; also used for red labels more generally.
バーゲン品には赤札が貼ってある。
Bargain items have red tags on them.
赤札のついた商品はすべて半額です。
All items with red tags are half price.
noun
In traditional Japanese gambling decks, the suit corresponding to swords; a domain-specific term.
花札では、赤札は剣の札を指すこともある。
In hanafuda, 赤札 can refer to the sword cards.