O ₂ arena

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O ₂ Arena refers to several multifunctional and event halls, which are named after the telecommunications brand O ₂ :

in London, United Kingdom, The O ₂ Arena , inside the O ₂
in Prague, Czech Republic, the O ₂ Arena (Prague)

In addition, several halls have had similar names in the past:

in Berlin the Mercedes-Benz Arena , formerly O ₂ World Berlin
in Hamburg the Barclaycard Arena , formerly O ₂ World Hamburg
in Dublin, Ireland the 3Arena , formerly The O ₂