noun
Refers to a blank area, empty space, or gap in a physical or abstract context, such as a form, text, or arrangement.
申込書の空所に必要事項を記入してください。
Please fill in the required information in the blanks on the application form.
壁に空所ができてしまった。
An empty space appeared on the wall.
Compound of 空 (empty) and 所 (place). The reading くうしょ follows the on'yomi of both characters.