2 possible definitions for '2'
Under this definition, 2 is a noun and has the following properties:
span, duet, brace, couplet, duo, pair, couple, twosome, craps, snake eyes, twain, distich, dyad, duad, yoke are types of '2'.
Under this definition, 2 is an adjective and has the following properties:
cardinal is similar to 2.