A really boring an monotonous task of entering mind numbing data into an antiquated computer system. May cause constipation, seizures, or delusions of sexy JewishAmericanPrincesses.
Before Google Maps, we used printed maps and the largest brand name in the UK was A-Z.
This was a series of street maps of most British towns and cities; properly the Geographer's A–Z Street Atlas.
Colloquially all road maps were known as A to Z.