QuIX has stood for many things over the years and in different settings. For the purposes of this space, <nop>QuIX represents a Qualitative Idiosyncratic Xenagogy, as below.
qualitative - Of descriptions or distinctions based on some quality rather than on some quantity. https://en.wiktionary.org/wiki/qualitative
idiosyncratic - Peculiar to a specific individual [or group]; eccentric. https://en.wiktionary.org/wiki/idiosyncratic
xenagogy - A guidebook. https://en.wiktionary.org/wiki/xenagogy
Take from the name what you will.