2A or II-A may refer to: Alberta Highway 2A Alpha-2A adrenergic receptor Keratin 2A Massachusetts Route 2A Stalag II-A Telecom 2A, a satellite the transcription factor II A the Deutsche Bahn IATA designator Second Amendment of various constitutions the Second Amendment to the United States Constitution that protects right to keep and bear arms the number of the French department Corse-du-Sud a strain of the bacterium Lactobacillus sakei 2A self-cleaving peptides See also A2 (disambiguation) IIA (disambiguation)