circled number
Refers to a numeral enclosed in a circle, such as ①, ②, etc., commonly used in lists, rankings, or annotations.
この資料では、項目に丸数字を使っています。
In this document, circled numbers are used for the items.
Compound of 丸 (まる, 'circle') and 数字 (すうじ, 'numeral').