ACR

Assembly Concurrent Resolution
Asamblea Resolución Concurrente

A measure that can be introduced in either house, but must be approved by both houses and filed with the Secretary of State to take effect. These measures usually involve the business of the Legislature. (e.g., adoption of the Joint Rules.)
https://www.sos.ca.gov/administration/bill-chapters/terms-defined#:~:text=Concurrent%20Resolution,House%20Resolution