[9] [[組版]]の世界で使われている[[長さ]]の単位です。
[CODE[級]]とか [CODE[Q]] とか言ったりします。

[1]

> [[級]], [[Q]] (1q = 0.25[[mm]]) [INS[([[JISX4052]]:2000 5.3.2. b)5))]]

[2] [CITE@en[Use upper case for Q unit]] ([[ericwilligers]]著, [TIME[2017-10-11 08:19:09 +09:00]]) <https://github.com/w3c/csswg-drafts/commit/76c77a76dcf0028c495d9f3bec4c8ecff688656a>

[3] [CITE@en['''['''css-values''']''' Use upper case for Q unit by ewilligers · Pull Request #1857 · w3c/csswg-drafts]] ([TIME[2017-10-12 17:28:11 +09:00]]) <https://github.com/w3c/csswg-drafts/pull/1857>

[4] [CITE[文字サイズの単位はポイントか級か - JAGAT]], [TIME[2020-03-27T05:46:57.000Z]], [TIME[2022-09-03T09:09:25.398Z]] <https://www.jagat.or.jp/past_archives/content/view/3165.html>