Your use of the word "global" is truly discriptive, but I believe that perl documentation reserves it for package variables. A possible alternative is "file scope variable".
in reply to Re: MCE seemingly stray array in sample code for Strassen's algorithm
in thread MCE seemingly stray array in sample code for Strassen's algorithm
Example: The description of "our" in perlfunc contains the following quote.
our associates a simple name with a package (read: global) variable in the current package,...