There are point) and interval estimators.

The point estimatorsyield single-valued results, although this includes the possibility of single vector-valued results and results that can be expressed as a single function. This is in contrast to an interval estimator, where the result would be a range of plausible values (or vectors or functions).

en.wikipedia.org/wiki/Estimator

A function

g: X → θfrom the sample space to the parameter space is called a point estimator ofθ.