noun
burning incense without revealing its source; pleasant smell from an unknown origin
Refers to the practice of burning incense in a way that the source is not obvious, or to a pleasant fragrance whose origin is unknown. Often used in literary or aesthetic contexts.
部屋に空薫の香りが漂っている。
The scent of incense burned without an obvious source is drifting in the room.
どこからともなく空薫が感じられ、心が落ち着いた。
A pleasant smell came from somewhere unknown, and I felt at ease.
Compound of 空 (そら, 'sky; empty') and 薫 (だき, from 薫く, 'to burn incense'). The exact historical derivation is uncertain.