Wut Is E-12 ?

Can anyone here pls tell me wut is E-12 ? thx alot

The Union currently has a common single market consisting of a customs union, a single currency managed by the European Central Bank (so far adopted by 12 of the 25 member states), a Common Agricultural Policy, a common trade policy, and a Common Fisheries Policy.<SUP class=reference id=_ref-0>[2]</SUP> A Common Foreign and Security Policy was also established as the second of the three pillars of the European Union. The Schengen Agreement abolished passport control, and customs checks were also abolished at many of the EU's internal borders, creating a single space of mobility for EU citizens to live, travel, work and invest