Matrix Number
A matrix number is an alphanumeric code (and on occasion, other symbols) stamped or handwritten (or a combination of the two) into the run-out groove area of a phonograph record. This is the non-grooved area between the end of the final band on a record's side and the label, also known as the run-off groove area, end-groove area, matrix area, or "dead wax". Industry usage A matrix number is intended for the internal use of the record manufacturing plant, but they are also studied and documented by record collectors, as they can sometimes provide useful information about the edition of the record. There are two parts of the matrix number to be considered: the ''main number'', which is usually printed on the label as well, and ''extra information'' which can include a cut or take number. ''Matrix numbers'' can refer to any of these elements, or all of them combined. The inscription area may also contain record plant codes or logos, the initials or signature of the disc cutting en ...
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