Any Zimmermann-Laband syndrome in which the cause of the disease is a mutation in the KCNN3 gene. It is characterized by developmental delay, intellectual disability, coarse face, gingival hyperplasia, and nail hypoplasia/aplasia. The disease is Zimmermann-Laband syndrome 3 (Monarch Disease Ontology identifier MONDO_0032854). Also known as: ZIMMERMANN-LABAND SYNDROME 3, ZLS3.