"ECB may be an abbreviation for:
European Central Bank, the central bank for the Eurozone of the European Union
Wisconsin Educational Communications Board
England and Wales Cricket Board, the governing body of cricket in England and Wales
Electronic codebook mode, a type of data encryption using block ciphers
Environment Campus Birkenfeld, a university of applied sciences in Birkenfeld, Germany
Equatorial Commercial Bank of Kenya
European Chemicals Bureau, the Toxicology and Chemical Substances Unit of the Joint Research Centre of the European Commission
Europe Card Bus, a type of computer data bus
External Commercial Borrowing, a type of commercial borrowing in India used for the public sector"
Source and further information:
http://en.wikipedia.org/wiki/ECB_(disambiguation%29

If you are looking for a bank related concept:
- European Central Bank, the central bank for the Eurozone of the European Union
- Equatorial Commercial Bank of Kenya
- External Commercial Borrowing, a type of commercial borrowing in India used for the public sector

External Commercial Borrowings.