Traditional Japanese playing cards (karuta), especially sets used for games like Hyakunin Isshu or Iroha karuta.
正月に家族で百人一首のかるたをした。
We played Hyakunin Isshu karuta with the family at New Year.
子どものころ、いろはかるたでひらがなを覚えた。
When I was a child I learned hiragana with Iroha karuta.
学校で教育用のカルタを使った授業を受けた。
I had a class that used educational karuta at school.