Final answer:
In the case citation Reeler v. Superior Court, 87 Cal. Rptr. 481, 470 P.2d 617 (Cal. 1970), the number 87 refers to the volume number of the California Reporter.
Step-by-step explanation:
In the case citation Reeler v. Superior Court, 87 Cal. Rptr. 481, 470 P.2d 617 (Cal. 1970), the number 87 refers to the volume number of the California Reporter. The California Reporter is a publication that contains the written opinions of the California courts.
To cite a legal case, the volume and page number where the case is published are included to make it easier to find the case in a law library or other legal research resources. The 87 in this citation indicates that the case can be found in Volume 87 of the California Reporter.