kanji radical 彡 on the right side
Refers to the three-stroke radical 彡 when it appears on the right side of a kanji, as in 形, 彩, or 影. Used in kanji descriptions and dictionaries.
The right-hand part of 形 is called さんづくり.
From 三 (さん, 'three') + 旁 (つくり, 'right-hand radical'), referring to the three strokes of the radical 彡.