| POSIX | Portable Operating System Interface Standard | 可移植操作系统接口标准 |
| POSIX | Portable Operating System Interface for Computing Environments (no longer used) | 用于计算环境的便携式操作系统接口（不再使用） |
| POSIX | Portable Operating System Interface for UNIX | UNIX的可移植操作系统接口 |
| POSIX | Portable Operating System Interface (IEEE Standard 1003.1) | 便携式操作系统接口（IEEE标准1003.1） |
| POSIX | Portable Operating System Interface for uniX (no longer used; see IEEE standard 1003.1) | uniX的便携式操作系统接口（不再使用；参见IEEE标准1003.1） |