"Hoi Polloi" you can't say "The Hoi Polloi" because "Hoi" is the Greek for " the" and you would be saying: "The the Polloi"

Something that has alternately peeved me and amused me is the frequent
duplication of the final word in a tech acronym.

These are the ones which come immediately to mind as being seen frequently.
CPU unit.
RAM memory
SIMM module
SPARC architecture
BASIC code
LAN network

And of course, at many restaurants, you can order your
french dip sandwich "with au jus."