noun
pilot light; spark
Refers to a small flame kept burning to ignite a larger fire, such as a pilot light in a gas appliance, or metaphorically a spark that starts something.
ガスコンロの種火が消えていた。
The pilot light on the gas stove had gone out.
その小さな出来事が革命の種火となった。
That small incident became the spark of the revolution.
noun
live coals for firelighting
Specifically refers to glowing embers or coals used to start a fire, similar to 火種 (ひだね). Often used in traditional or camping contexts.
See also: 火種 (ひだね)
キャンプで種火を絶やさないように気をつけた。
We were careful not to let the live coals go out while camping.