technicalia
Technical details, especially ones that are tedious or of little interest to nonspecialists; technicalities.
Copernicus himself made few observations but was steeped both in the technicalia of astronomical geometry and in the humanistic tradition.
Technical language; jargon.
[…]though much of the Latin loan material consists of military or governmental technicalia, there exists, in addition, a considerable stratum which provides insight into the lexical equipment of the more popular levels of society.
Where it comes from
By surface analysis, technical + -ia (“a collection of things”). Evidently modelled after other nouns descended from substantivized Latin -ālis adjectives in the neuter plural: marginalia, paraphernalia, generalia, regalia, militaria, etc.
Adapted from the Wiktionary entry technicalia (CC BY-SA 4.0).