中文字号的号数制及字体度量单位。 Chinese size system (hào-system) and type-related measurements units.
#import "@preview/pointless-size:0.1.0": zh, zihao
#set text(size: zh(5)) // 五号（10.5pt）
// or
#set text(zh(5))
#show: zihao(5)
// 小号用负数表示 use negative numbers for small sizes
#zh(-4) // 小四（12pt）
#zh(1) // 一号（26pt）
#zh(-1) // 小一（24pt）
#zh("-0") // 小初（36pt）
#zh(0) // 初号（42pt）
字号没有统一规定，本包默认与 CTeX、MS Word、WPS、Adobe 的中文规则一致。 Chinese size systems were not standardized. By default, this package is consistent with Chinese rules of CTeX, MS Word, WPS, Adobe.
如想覆盖定义：If you want to override:
#import "@preview/pointless-size:0.1.0": zh as _zh
#let zh = _zh.with(overrides: ((7, 5.25pt),))
#assert.eq(_zh(7), 5.5pt)
#assert.eq(zh(7), 5.25pt)Tip
- ✅ = 一致 consistent
- 👪 = 与描述的规则之一一致 consistent with one of the described rules
- 🚸 = 不完全一致 not fully consistent
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🚸§2.3.5 基本版式设计的注意事项 - 中文排版需求 | W3C 编辑草稿（中/英）[2024-09-13]
“号”由于当年金属活字各地厂家的规范不一而不尽相同……不作为规范性规定。
§2.3.5 Considerations when Designing the Type Area - Requirements for Chinese Text Layout | W3C Editor's Draft (Chinese & English)
These hào-systems were not standardized by the various foundries in the past. …It is not normative information.
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✅表25 中文字号 - CTeX v2.5.0 (2022-07-14) 宏集手册 | CTAN（中文）
Table 25 Chinese text size - Documentation of the package CTeX v2.5.10 (2022-07-14) (Chinese)
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👪字体度量单位 - CJK Type Blog | Adobe（中/英）[2009-04-02] (archive.today)
Type-related Measurements Units (Chinese & English)
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✅如何转换字号、磅、px？- 技巧问答 | WPS学堂（中文）[2020-05-07]
How to convert between hào, point, and pixel? - Tech Q&A | WPS learning (Chinese)
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#135 显明解行号号珍 - 字谈字畅 | The Type（中文，带文字说明的播客）[2020-09-09] (archive.today)
(Chinese, podcast with show notes)
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#543 ctexsize: 重设各级字号大小 - CTeX-org/ctex-kit | GitHub（中文）[2020-10-13]
#543 ctextsize: Redesign the font size system (Chinese)
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✅CY/T 154—2017 中文出版物夹用英文的编辑规范 - 行业标准 | 全国标准信息公共服务平台（中文）[2017-04-17]
11.2.1 中文文本中夹用英文时，英文字号应与中文字号匹配。常用的为：中文“小五号”与英文“9P”相对应，中文“五号”与“10.5P”相对应。
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✅GB 40070–2021 儿童青少年学习用品近视防控卫生要求 - 国家标准 | 全国标准信息公共服务平台（中文）[2021-02-20]
其中用到了号数制，例如4.3.1“小学一、二年级用字应不小于16P（3号）字”。总结下来是三号 16pt、四号 14pt、小四 12pt、五号 10.5pt、小五 9pt。
GB 40070–2021 Hygienic requirements of study products for myopia prevention and control in children and adolescents - National standards | National public service platform for standards information (Chinese)
The standard uses hào-system, e.g. 4.3.1 “texts for grade 1/2 of primary school should not be less than 16P (size 3)”. To summarize, size 3 = 16pt, size 4 = 14pt, size small 4 = 12pt, size 5 = 10.5pt, size small 5 = 9pt.
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👪字号（印刷）| 维基百科（中文）
Hào (typography) | Wikipedia (Chinese)