8 x 45

8x45 refers to a method of indexing or identifying items by using an 8-character identifier followed by a 45-character identifier. This notation implies a system where objects or concepts are classified within a two-tiered structure. The initial "8" represents a primary category or grouping, using a code of up to eight characters in length. The "45" then represents a more specific sub-classification or identification, using a code of up to forty-five characters in length, within that primary category.

The exact meaning and application of "8x45" are dependent on the specific context in which it is used. Without further contextual information, it is difficult to determine precisely what is being indexed. However, the structure suggests a hierarchical organization. It could be used in database systems, product identification, library systems, geographic coordinates, or any other situation requiring a two-level indexing system. The choice of an 8-character and 45-character length suggests a balance between a manageable initial classification and a highly detailed, granular sub-classification. The characters used in each section would also vary depending on the specific implementation and may include alphanumeric characters, symbols, or a combination thereof.