Template:ValidUnusedImage

[[Media:]]

Usage
Put reason on images that should not be deleted even if the MediaWiki software believes they are unused. Examples include: Note that images may be deleted anyway if the reason is deemed not sufficient, though this probably should be discussed first.
 * "Part of icon set of category XYZ"
 * "Used on User:ABC's user page inside choose tags"
 * "Linked to by article QRS"
 * "Thumbnailed version utilized by wiki skin for GHI"