All reports of duplicate-font-file for the archive. The extended description of this tag is:
This package appears to include a font file that is already provided by another package in Debian. Ideally it should instead depend on the relevant font package. If the application in this package loads the font file by name, you may need to include a symlink pointing to the file name of the font in its Debian package.
Sometimes the font package containing the font is huge and you only need one font. In that case, you have a few options: modify the package (in conjunction with upstream) to use libfontconfig to find the font that you prefer but fall back on whatever installed font is available, ask that the font package be split apart into packages of a more reasonable size, or add an override and be aware of the duplication when new versions of the font are released.
This tag has not been emitted in any package tested by Lintian.