What does ADIF stand for?

What does ADIF mean?

ADIF	Accounting Data Interchange Format Business » Accounting
ADIF	Accounting Data Interchange Format Computing » Telecom
ADIF	Administrador De Infraestructuras Ferroviarias Business » Positions
ADIF	Association for the Defense of the International Humanitarian Fundamental Laws Community » Non-Profit Organizations
ADIF	Amateur Data Interchange Format Academic & Science » Amateur Radio