Could you please clarify what you mean? For example:

Designers and editors often use these strings as temporary file names that become the name for a specific aesthetic or collection. Creating Aesthetic Photos

In photography management software (like Lightroom or Google Photos), there is a feature called

They serve as a "secret code" for niche communities to find specific types of edits or collections.

Since "fgghhh photo" is not a standard term, here is your checklist: