| X/OPEN Transport Interface (XTI) | Interfaz de Transporte X/OPEN |
| XDR (eXternal Data Representation) | Representación Externa de Datos |
| Xerox Network Services (XNS) | Protocolo de Red de Rank Xerox |
| XGA (eXtended Graphics Array) | Matriz de Gráficos Extendida |
| XMA (eXtended Memory Adaptor) | Adaptador de memoria extendida |
| XMM (eXtended Memory Manager) | Administrador de Memoria Extendida |
| XMS (eXtended Memory Specification) | Especificación de Memoria Extendida |
| XNS (Xerox Network Services) | Protocolo de Red de Rank Xerox |
| XOR (eXclusive OR operator) | Operador "O" exclusivo |
| XTI (X/OPEN Transport Interface) | Interfaz de Transporte X/OPEN |