The phrase "multiple unknowns" refers to a situation where there are many things that we don't know or understand. It suggests that there are many variables or questions that are unclear or need further investigation. Full definition
Pooled DNA from multiple unknown organisms arises in a variety of contexts, for example microbial samples from ecological or human health research. (journals.plos.org)
Pooled DNA from multiple unknown organisms arises in a variety of contexts. (journals.plos.org)
But today, the group released what's probably its most explosive — and damaging — dump yet: a collection of several alleged NSA hacking tools for Microsoft Windows systems, likely including multiple unknown exploits, or zero - days. (motherboard.vice.com)