HAD - Hierarchical Aggregation Decompression

HAD - Hierarchical Aggregation Disaggregation

HAGO - Have A Good One

HAL - Hardware Abstraction Layer

HAL - Heuristically Programmed Algorithm

HARN - High Accuracy Reference Network

HAS - Hybrid Access System

HBA - Host Bus Adapter

HBS - Harvard Business School

HCA - Huffman Coding Algorithm

HCB - High Capacity Battery

HCC - Horizontal Cell Collection

HCI - Human - Computer Interaction

HCN - Hierarchical Computer Network

HCS - Header Check Sequence

HD - Hamming Distance

HD - Hard Disk

HD - High Density

HDB - Heterogeneous Database

HDB - Historical Database

HDBMS - Hierarchical Database Management System

HDBS - Heterogeneous Data Base System

HDC - Half Duplex Communication

HDD - Hard Dick Drive

HDF - Hierarchical Data Format