Definition of blue card:
(n) :
(European Union) An EU-wide work permit allowing high-skilled non-EU citizens to work and live in any country within the European Union, excluding Denmark and Ireland, which are not subject to the proposal.
(n) :
(Australia, Queensland) An identity card issued with police approval, stating that the person is of suitable character to work near children and young adults.
(n) :
(scouting, US) An application for pursuing a certain merit badge, which must be signed by a Scout's unit leader and their merit badge counselor before pursuing.
(n) :
(sports) A penalty card that in association football indicates an offense at a lesser level than a yellow card, and has other meanings in bandy, handball, and Quidditch.