This is the "Product Code" or "ID." In many international media markets, especially the Japanese adult video (JAV) industry, every release is assigned a unique alphanumeric code. "SONE" refers to the production studio or label, while "290" is the specific volume number in that series.

A marketing term used to indicate that the specific edit, subtitle track, or high-definition version is unique to a particular distributor. Why This Keyword Is Popular

An acronym for "Japanese Adult Video," the specific genre of the content.

When you see a string like this, it is usually a "slug" used by search engines and databases to categorize content. Here is how it likely breaks down: