In terms, thermo (TR:5) (LH:1) (TL:6), Greek: Θέρμο (N:224), "hot", or θερμος (N:424), "warm" or "heat", from the Greek letter “θ” [N:9], sound “th-”, pronounced "theta" [N:318], the letter symbol (9th letter of the Greek alphabet) code for the Egyptian sun god, and or sun god symbol: , , ⊕, ⊗, or ⊙, etc., representative of an ancient complex solar cosmology, the number nine code the Egyptian "Ennead", the supreme "sun god family" (paut), is a modern prefix that signifies things related to heat.
The following are related quotes:
- “In modern times, instruments have been invented for noting variable ‘degrees’ of heat and cold, which, under the designation of thermometers, thermoscopes, pyrometers, or pyroscopes, are not in general use in every part of the civilized world. Their names are, derived from Greek terms: θερμος [thermos], πνρ [fire] [N:230], signifying ‘heat’ and ‘fire’, and μετρον, σχοπος, a ‘measure’ and ‘investigator’.”
- — Thomas Traill (1823), Thermometer and Pyrometer (pg. 1) 
- Thermo- – Hmolpedia 2020.