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Meta Tags
A collection of meta tags.
Meta tags are collections of related tags; danbooru style image boards call them 'tag groups'.
A few theme tags are included in this list of meta tags; these theme tags are Crazy Mutant Tags That Ate Tokyo, otherwise known as borderline meta tags. An example is Musical Instrument. This could be a meta tag except that it's also used as a catch-all "it's some kind of instrument but I don't know the name for it" tag.