Flight-ABB is an useful application to find Abbreviations and Acronym for Pilots.
The APP has 5 Abbreviation lists:

Abbreviation (All abbreviations use in Aviation for Pilots);

CPDLC Messages (Commonly Used CPDLC Message Elements);

Airports (IATA Code, ICAO Code, Name, City and Country Flag);

Registrations (Airplane Registration Codes);

Airlines (IATA Code, ICAO Code, Name and Country).

The Abbreviation database contains more than 11,000 abbreviations from different authorities and regulations including:
FAA Abbreviations;
United States of America Aeronautical Contractions;
NOTAM Abbreviations;
Canadian AIM Abbreviations;
Abbreviations uses in Performance Based Navigation;
Jeppesen Abbreviations;
Boeing Acronym;
EASA Acronyms;
Dangerous Goods Abbreviations
Ground Handling Abbreviations and Codes;
And more.

This APP has the more comprehensive database in APP Store!

Flight-ABB was specially designed for Flight Crews.