We prove that compactoid subsets of non-archimedean
Hausdorff (LM)-spaces are metrizable, the non-archimedean
counterpart of a well-known theorem in Functional Analysis
over
or
,
which was raised by K. Floret in
1980. In this way we also extend and improve the previous result
about metrizability of compactoid sets for the particular
case of Hausdorff (LB)-spaces, given by N. De Grande-De Kimpe, J.
Kakol, C. Perez-Garcia and W.H. Schikhof in [p-adic
locally convex inductive limits. In: p-adic Functional Analysis,
159-222, Lecture Notes in Pure and Appl. Math., 192, Marcel Dekker,
New York, 1997].