: The format, confirming this is physical media rather than a digital-only release. : The publisher/series code. : The specific volume number in the sequence.

Elias didn't have time to scream. The lights in the archive room shattered, plunging him into darkness. But in the reflection of his black monitor, he saw the sphere, floating just behind his left shoulder.

: Indicates the physical media format is a Digital Versatile Disc .

At first glance, it looks like a standard inventory SKU or a catalog number. But for those who track Japanese media and "Idol" culture, it tells a more specific story. What is the "CPSKY" Series? The prefix is a catalog identifier used for a specific line of Japanese "Idol" or "Image" DVDs