Request for judicial notice is a widely deployed vehicle for bringing court's attention to certain materials and records. In California, it is regulated by the California Evidence Code ("CEC"), Sections 450-460. It generally defines what requires judicial notice be mandatorily taken (CEC 451), and what may be judicially noticed at court's discretion (CEC 452, 452.5). The rule is also stated for the contrary: what is not authorized by law, may not be judicially noticed (CEC 450). If the court declines to take judicial notice, the court shall let the parties know about its decision a.s.a.p., and indicate the denial on the record (CEC 456). However, such denial is never final and can be later reversed (CEC 458).
As comprehensive as the judicial notice statutes are written, they can't physically encompass every possible kind of matter litigants may request the court to take judicial notice of. It thus brings the question, what kind of non-obvious materials were previously judicially noticed? This post is a short review of items I was able to identify.