An atlas is a book or collection of maps, often showing countries, cities, and physical features of the world.
It is named after Atlas, the Titan in Greek mythology who was said to hold up the sky or the world. Early mapmakers often drew Atlas carrying the globe, and eventually his name became linked with collections of maps.
The idea of a single figure 'holding up' the whole world fits nicely with a book that contains the whole world in pages. An atlas lets you carry entire continents under your arm—a kind of everyday superpower we easily forget.
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