 |  |  |
| HD | Half Duplex | 半双工 |
| | High Density | 高密 |
| | Hard Disk | 硬盘 |
| HDC | Hard Disk Connector | 硬盘连接器 |
| HDD | Hard Disk Drive | 硬盘驱动器 |
| HDTV | High Density Television | 高密度电视 |
| HEX | Hexadecimal | 十六进制 |
| HGA | Hercules Graphic Adapter | 大力士显示适配器 |
| HPC | Handheld Personal Computer | 手持个人电脑 |
| HPPI | High Performance Parallel Interface | 高性能并行接口 |
| HTML | Hyper Text Makeup Language | 超文本标记语言 |
| HTTP | Hyper Text Transfer Protocol | 超文本传送协议 |
| HTTP-NG | Hyper Text Transfer Protocol - Next Generation | 下一代超文本传送协议 |
| Hz | Hertz | 赫兹 |
