The term "2a" can have different meanings depending on the context. Here are some possible interpretations:

• In the context of hair types, "2a" refers to a type of wavy hair that is versatile and easy to style.
• In the context of satellite technology, "2a" can refer to Telecom 2A, a satellite.
• In the context of highways, "2a" can refer to Alberta Highway 2A or Massachusetts Route 2A.
• In the context of adrenergic receptors, "2a" can refer to alpha-2A adrenergic receptor.
• In the context of the US Constitution, "2a" can refer to the Second Amendment, which states that "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed".

Without additional context, it is impossible to determine the meaning of "2a" with certainty.