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What does A4 stand for?

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Rank Abbr.Meaning
A4Alternative 4
A4Aggregate 4 (German V2 rocket)
A4Automatic Four Speed
A4International Paper Size closest to US Letter Size; 210mmx297mm or 8.27x11.69"
A4Cryptographic standard for mobile/cellular phones

Note: We have 3 other definitions for A4 in our Acronym Attic

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