A9 meaning

An ARM-based system-on-chip (SoC) used in Apple's iPhone 6s devices. See Apple A series.
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A standard paper size, defined by ISO 216, with dimensions: 53 x 37 mm (52.556 x 37.163 mm)
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Origin of a9

  • See the Wikipedia article ISO 216, the international standard on paper sizes.

    From Wiktionary