1º_ 'Aar' is the name of a Swiss river and mountain massif. It is of Celtic etymology, where aa is "watercourse, river, stream". See Aa, Aare. 2º_ 'Aar' or 'Aaru' is the name of the Egyptian paradise, to which the souls of those who could offer a light heart of earthly acts arrived, weighing the same as the Maat (cosmic harmony). 3º_ 'AAR' is the IATA code for Tirstrup Airport, in Aarhus (Denmark).
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