21E3

21E3 is an alphanumeric code used across various industries to designate an item, document, or version. Unlike a unique corporate product name, it does not refer to a single entity and has no universally fixed meaning. The meaning of 21E3 is determined by the domain and the system that assigns it.

In manufacturing and electronics, codes like 21E3 commonly appear as model numbers, lot identifiers, revision stamps, or catalog references attached to components, assemblies, or equipment. In software and publishing, it can serve as a build identifier, revision tag, or catalog entry number. In transportation and logistics, similar alphanumeric codes are used to label routes, shipments, or inventory locations, though 21E3’s specific use would be defined by the relevant organization. In science and medicine, a reagent, sample, or catalog item might bear such a code in its labeling.

Because 21E3 is not tied to a single reference, its precise meaning varies with context. A given 21E3 typically requires accompanying metadata to determine its interpretation. If a particular 21E3 is of interest, identifying the issuing organization, the field of use, or the document or device where it appears helps locate the correct interpretation.