small hanafuda deck
Refers to a compact hanafuda deck, typically with fewer cards than a standard deck, used in certain games or as a portable variant.
旅行のときは小花を持っていく。
I take a small hanafuda deck when traveling.
Compound of 小 (ko, 'small') and 花 (hana, 'flower'), referring to the flower-themed cards of hanafuda. The reading こばな is a standard rendaku form.