"Hex" is a short form of "hexagon", a six-sided plane figure used as the tile in turn-based strategy games such as Civilization V, Civilization VI, and Imperialism. Not to be confused with "hexadecimal", which is a base 16 numeral system.
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.jpg "Hex Grid (Civ5).jpg (280 KB)")
Strategic view from Civilization V, showing a grid of hexes
.jpg "Hex Grid (Civ6).jpg (297 KB)")
Strategic view from Civilization VI, showing a grid of hexes with irregular edges