| Subject | English | Chinese |
| comp., MS | class identifier | 類別識別項 (A universally unique identifier (UUID) that identifies a COM component. Each COM component has its CLSID in the Windows registry so that it can be loaded by other applications) |
| telecom. | object class identifier | 客体类别标识符 |
| IT | QoS class identifier | 服务质量类别标识 |
| avia. | user class identifier | 用户类别标识符 |