The purpose of this family of standards is to establish a worldwide series of short abbreviations for places, for use on package labels, containers and such. Anywhere where a short alphanumeric code can serve to clearly indicate a location in a more convenient and less ambiguous form than the full place name. US readers may wish to consider them as the equivalent of worldwide zip or postal codes. Within the Wikipedia, the codes from the country pages link to the pages for the locations they identify.
The codes are currently not part of the ISO 3166-2 standard. They were only present in a draft version before the actual publishing, but were withdrawn as being not relevant enough.
Encoding table
TV-FUN Funafuti
TV-NMG Nanumanga
TV-NMA Nanumea
TV-NIT Niutao
TV-NIU Nui
TV-NKF Nukufetau
TV-NKL Nukulaelae
TV-VAI Vaitupu
References