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| alpha character | |||
| letter symbol | |||
| alphabetic notation; literal symbol | |||
| literal character (ssn); letter character (ssn) | |||
| alphabetic character (The (xxx) field may only contain alphabetical characters.) | |||
| буквенный символ: 22 短语, 10 学科 |
| 信息安全 | 2 |
| 信息技术 | 1 |
| 媒体 | 1 |
| 安全系统 | 2 |
| 技术 | 4 |
| 数据处理 | 1 |
| 电子产品 | 3 |
| 编程 | 5 |
| 计算 | 2 |
| 音乐 | 1 |