And that's referenced right in the middle of the second paragraph of perldata:

... In some cases, it may be a chain of identifiers, separated by "::" (or by the slightly archaic "'"); all but the last are interpreted as names of packages, to locate the namespace in which to look up the final identifier (see "Packages" in perlmod for details).

In reply to Re^2: single quote in package variable names by Fletch
in thread single quote in package variable names by caelifer

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