In the citation, davis v. baugh industrial contractors, inc. 159 wash. 2d 413, 150 p. 3d 545 (2007) what does the "2d." represent

The "2d" represents the second series of the edition of the publication reporting on the case. In this reporter, the 413 after the "2d" would show that this is the 1,413th edition of the publication, since most reporters will reset their numbering schemes once 999 has been passed.