If you were not writing in a technical context, an option is the noun, trio:
- [countable + singular or plural verb]
a group of three people or things
A trio of English runners featured in the women's 1500 metres.
However, for technical contexts triple is perfectly fine. You can use triple as a noun, as the Merriam Webster dictionary indicates. Wiktionary indicates that one of the few uses of triple as a noun is:
(mathematics, computing) A sequence of three elements or 3-tuple.
For your case, I would recommend triple because trio sounds a bit more hoity-toity. Both would be accurate, but I think triple carries the right tone. (For example, there are Pythagorean triples but not Pythagorean trios).