- In modern Chinese scripts, the radical component on the left is written 糹 (three dots below 幺).
- In Japanese kanji and Korean hanja, the radical component on the left is written 糸 (小 below 幺 but the middle stroke of 小 is written with a 丨 vertical stroke without bottom hook), which is the historical form found in the Kangxi dictionary.
- In traditional Chinese and Korean hanja, the 及 component on the right contains 又, which is the historical form found in the Kangxi dictionary.
- In mainland China (for the traditional form based on Xin Zixing (新字形)), Japanese kanji and Vietnamese Nôm, the 及 component on the right does not contain 又 and is written in 3 strokes (丿 followed by ⿱乛乛 and ㇏).
級 (radical 120, 糸+4 in traditional Chinese and Korean, 糸+3 in mainland China and Japanese, 10 strokes in traditional Chinese and Korean, 9 strokes in mainland China and Japanese, cangjie input 女火弓竹水 (VFNHE), four-corner 27947, composition ⿰糹及(GHTV) or ⿰糸及(JK))
- KangXi: page 918, character 5
- Dai Kanwa Jiten: character 27294
- Dae Jaweon: page 1348, character 1
- Hanyu Da Zidian: volume 5, page 3366, character 2
- Unihan data for U+7D1A