English

Alternative forms

• (cardiology): A₂

Adjective

A2 ‎(not comparable)

1. A standard paper size, defined by ISO 216.

   dimensions: 594 x 420 mm (594.60 x 420.45 mm)

2. (virology) A type of Asian influenza virus.
   • 1877, John Holmes Dingle, Biographical Memoirs, volume 61:

     ...antibody response to Influenza (A2) virus.

3. (cardiology) Aortic second sound.
   • 2012, Perloff, Joseph K.; Marelli, Ariane, Perloff's Clinical Recognition of Congenital Heart Disease:

     and the aortic component of the second sound (A₂) is normal.

See also

• (A paper sizes): 2A0   A0   A1   A2   A3   A4   A5   A6   A7   A8   A9   A10

Italian

Adjective

a2

1. (music) Abbreviation of a due.

Mandarin

Romanization

a2 (Zhuyin ㄚˊ)

1. Alternative spelling of á