Eurocode 2 and EC2 are both abbreviations for BS EN 1992, Eurocode 2: Design of concrete structures. There are four parts to BS EN 1992 but when referring to Eurocode 2 most people mean BS EN 1992-1-1 general rules and rules for buildings.
 
Although there continues to be a transition period, eventually Eurocode 2 will replace all national codes dealing with the design of structural concrete (such as BS 8110, BS 8007, BS 5400 in the UK). All the parts of Eurocodes relevant to the design of concrete have been published, and BS 8110 is no longer being supported by the relevant British Standards Institute committee..
 
Eurocode 2 has four parts: 
 
BS EN 1992-1-1:2004 Design of concrete structures. General rules and rules for buildings
BS EN 1992-1-2:2004 Design of concrete structures. General rules. Structural fire design
BS EN 1992-2:2005 Design of concrete structures. Concrete bridges. Design and detailing rules
BS EN 1992-3:2006 Design of concrete structures. Liquid retaining and containing structures