legend
US /ˈledʒ.ənd/
UK /ˈledʒ.ənd/

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legenda, chave
a caption or key accompanying a map, chart, or illustration
:
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Refer to the legend to understand the symbols on the map.
Consulte a legenda para entender os símbolos no mapa.
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The chart's legend explains the different colored bars.
A legenda do gráfico explica as diferentes barras coloridas.