Õ: "unikaalne" selles tähenduses on eksitav

olemus
in mathematics, logic:
the property of being the one and only object
satisfying a certain condition

https://mathworld.wolfram.com/Unique.html

https://en.wikipedia.org/wiki/Uniqueness_quantification

https://lisbdnet.com/what-does-unique-mean-in-math/