legend

US /ˈledʒ.ənd/
UK /ˈledʒ.ənd/
"legend" picture
1.

a traditional story sometimes popularly regarded as historical but unauthenticated

:
The legend of King Arthur is well-known.
Local legends speak of a hidden treasure.
2.

an extremely famous or notorious person, especially in a particular field

:
He is a true football legend.
She became a rock and roll legend.
3.

a caption or key accompanying a map, chart, or illustration

:
Refer to the legend to understand the symbols on the map.
The chart's legend explains the different colored bars.