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2006, Thomas Pynchon, Against the Day, Vintage 2007, p. 665:
Which is how Kit first heard about the T.W.I.T. back in London, and of the ghostly neo-Pythagorean cult of tetralatry or worship of the number four, currently the rage in certain European circles
The prefix tetra- is mainly used in the names of chemical compounds or in words that have been loaned from other languages with the tri- prefix already there. For other words, the prefix neli-, which is derived from the Finnish word neljä(“four”) is preferred.