A4: 維基媒體搞清楚版
A4或a4可以係：
- 164嘅十六進制寫法
- A4紙：ISO-216紙嘥士標準一種。
- 殘疾人體育賽事醫學分級入面講嘅「單髀低位截肢」。
- Audi A4：Audi汽車嘅其一品種
| 一覽 | ||
|---|---|---|
| 周邊 | ||
| A3 | A4 | A5 |
| B4 | ||
| 互換 | ||
| A4 | ⇄ | 4A |
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