A Hardware Attached on Top (HAT) is a specification for add-on modules for the Raspberry Pi computer, designed for consistent electrical and mechanical interfacing.

Header pins are electrical connectors used for creating solderless or soldered connections between circuit boards and other components.

A heat gun is an electric tool that emits a stream of hot air for various applications.

Heat shrink is a protective plastic sheath that contracts when exposed to heat, used for insulating wires and cables.

A tool consisting of articulated arms and clips used to securely hold workpieces in place during assembly or soldering.

The hot-end is the component of a 3D printer that melts and extrudes thermoplastic filaments to create printed objects.