In previous investigations it was reported that certain transition metal-rich amorphous alloys consist of distorted bcc nano-clusters. Two kinds of these amorphous alloys are of special interest due to their physical properties: (1) metallic glasses with no boundaries between grains and (2) nanoglasses. Nanoglasses are specified with a high proportion of boundary /Interface between amorphous grains. Similar to the nanoglasses, the nano-sized crystalline clusters such as bcc-Fe clusters consist meanly of two components: (1) nanometer-size bcc-Fe clusters (frequently called nanograins with sizes of about 3 nm or less) and (2) Interfaces between grain. A fundamentally feature of these materials seems to be their magnetic properties that are controlled by a quantum mechanical effect, the indistinguishability effect. Based on the experimentally observed magnetic properties of nano-sized bcc-Fe, it is suggesting that the application of the indistinguishability effect may open the way for the production and understanding of this class of materials.