| Name | LATIN CAPITAL LETTER A WITH DIAERESIS LATIN CAPITAL 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 c384 |
| UTF-16 Encoding | Ä 00c4 |
| UTF-32 Encoding | Ä 000000c4 |