What a hookah head is, and what makes one electronic
On a traditional hookah, the hookah head is the bowl on top of the stem. It holds the shisha (a flavored, molasses-based tobacco mix), gets covered with foil or a heat-management device, and is heated from above by lit charcoal. Air pulled through the hose drags smoke from the head down the stem, through the water in the base, and up to you. When people search for "hookah head meaning", this bowl is what the term refers to.
An electronic hookah head keeps the same position on the stem but replaces everything inside the bowl. Instead of shisha and charcoal it carries a sealed e-liquid reservoir, a heating coil and a rechargeable battery. There is no foil to poke, no coals to light and no ash to empty. The base, water, stem and hose can all stay as they are.
Electronic hookah heads sit inside the broader electric hookah category, which also covers standalone hookah pens that never touch a base. The distinction matters when you shop: a head is designed to live on top of a hookah, while a pen is designed to live in your pocket.