What does Fy stand for?

Duffy - Blood group

Ferry - Nautical charts

Fall Yearling - Pisciculture

Feng Yun Satellite (SAUS)

Ferry - GeoNet geographic features code (GEON)

Final Year (SAUO)

Financial Year

Fiscal Year - Business term

Fishery Flag - Navy - British

Flashing Yellow (SAUS)

Fort Yukon - Alaska - Seismograph station code, US Geological Survey

Full Year

Future Value - Business term (EBF)

Metroflight Airlines and Great Plains Airline - ICAO designator (AD)

South Africa - Later, BL - License plate code assigned to foreign diplomats in the US