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a1 or A  audio  () KEY 

NOUN:
pl. a's or A's also as or As
  1. The first letter of the modern English alphabet.
  2. Any of the speech sounds represented by the letter a.
  3. The first in a series.
  4. Something shaped like the letter A.
  5. A The best or highest in quality or rank: grade A milk.
  6. Music
    1. The sixth tone in the scale of C major or the first tone in the relative minor scale.
    2. A key or scale in which A is the tonic.
    3. A written or printed note representing this tone.
    4. A string, key, or pipe tuned to the pitch of this tone.
  7. A One of the four major blood groups in the ABO system. Individuals with this blood group have the A antigen on the surface of their red blood cells, and the anti-B antibody in their blood serum.

IDIOM:
from A to Z
Completely; thoroughly.



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