Wash. Rev. Code § 23B.06.010
(1) The articles of incorporation must prescribe the classes of shares and the number of shares of each class that the corporation is authorized to issue.
(3) The articles of incorporation may authorize one or more classes of shares that:
[ 2020 c 194 s 5; 1998 c 104 s 1; 1989 c 165 s 44.]