spring brazier; hand-warming brazier
A small brazier used especially in spring to warm cold fingers; a seasonal item associated with the lingering chill of early spring.
Since it's still cold in early spring, I warm my hands with a spring brazier.
Compound of 春 (spring) and 火鉢 (brazier). The exact historical origin is uncertain, but it likely refers to a brazier used during the chilly early spring period.