| Name | LATIN SMALL LETTER A WITH DIAERESIS LATIN SMALL LETTER A DIAERESIS |
| Unicode Version | 1.1 |
| Block（ブロック） | Latin-1 Supplement（ラテン1補助） |
| Plane（面） | Basic Multilingual Plane（基本多言語面） |
| Script | |
| Category | |
| Bidirectional Class | |
| Combining Class | |
| Character is Mirrored | |
| HTML Entity | ä ä |
| UTF-8 Encoding | ä c3a4 |
| UTF-16 Encoding | ä 00e4 |
| UTF-32 Encoding | ä 000000e4 |