International Journal of Neutrosophic Science IJNS 2690-6805 2692-6148 10.54216/IJNS https://www.americaspg.com/journals/show/782 2020 2020 Mathematics, Physics and Natural Sciences Division,The University of New Mexico, 705 Gurley Ave., Gallup, NM 87301, USA Florentin Smarandache        Indeterminacy makes the main distinction between fuzzy intuitionistic fuzzy (and other extensions of fuzzy) set logic vs. neutrosophic set logic, and between classical probability and neutrosophic probability. Also, between classical statistics vs. neutrosophic and plithogenic statistics, between classical algebraic structures vs. neutrosophic algebrais structures, between crisp numbers vs. neutrosophic  numbers. We present a broad definition of indeterminacy, various types of indeterminacies, and many practical applications.  2021 2021 89 97 10.54216/IJNS.150203 https://www.americaspg.com/articleinfo/21/show/782