APRONYM

purity
100% ISO (2)Initials Swapped Over? Angela Brett (ISO usually means International Organization for Standardization, so it seems as though its abbreviation should be IOS. However, ISO is not an acronym... as explained at http://www.iso.org/iso/en/aboutiso/introduction/index.html#three)
Words & Wordplay:Acronyms about Acronyms
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