Needs to be evaluated by a gunsmith.
The SIGMA is reliable if fed quality ammunition.
If you mean What is the Latin for rainbow, it is arcus pluvius, or arcus alone, Arcus is a 4th declension noun, so its plural is not "arci" but arcus.
The Romans associated Arcus with Iris.
Arcus Odyssey was created in 1991.
Arcus Odyssey happened in 1991.
Arcus Argentariorum was created in 204.
Arcus-Air Logistic was created in 1973.
To answer the question I think you're asking: you can buy some cheap 9mm handguns for $150-300, but to get anything actually reliable, you'll probably have to spend $400 or more. That said though, people have different definitions of the word "reliable."
Rainbow = Arcus Iris; also either word alone. Horace used "arcus pluvius," however most Romans probably just said "arcus."
Arcus is not a Greek god, but a roman god. She corresponds to Iris, goddess of the rainbow - messenger of the gods, in Greek mythology.
The answer is arguable, as there are a lot of very reliable 9mm pistols out there. One pistol that I have never had problems with, and that has a reputation for having both excellent reliability and accuracy is the SigSauer P226.
Arcus (-i, m).