When a bill has been passed by the Legislature and enacted into law, the Secretary of State assigns the bill a "chapter number" such as "Chapter 123, Statutes of 1992," which is subsequently used to refer to the measure in place of the bill number.

an article from the Law category

After a bill has been signed by the Governor, the Secretary of State assigns the bill a "Chapter Number" such as "Chapter 123, Statutes of 1992," which is subsequently used to refer to the measure rather than the bill number.

A bill passed and signed into law by the Governor. The term also applies to Constitutional Amendments passed by the General Assembly and to bills passed, notwithstanding the Governor's objections or amendments.

Once the Governor has signed a bill, it is sent to the Secretary of State, who assigns a session law chapter number, (e.g. Chapter 35 of the Laws of 1995). Between the time the chapter number is assigned and the time the bill is incorporated into the Revised Code of Washington (RCW), the session law is the law of the state.