Each paper filed pursuant to these rules should be dated and signed by an attorney (with the attorney's Washington State Bar Association membership number in the signature block) or party, except papers prepared by a judge, commissioner or clerk of court, bonds, papers comprising a record on review, papers that are verified on oath or by certificate, and exhibits. The signing attorney or party may also indicate their personal pronouns in the signature block.
References
CR 11, Signing of Pleadings.
Wash. R. App. P. RAP 18.7