This little demo in the debugger (without strict) should make it clearer
DB<5> print "x".NAME # bareword treated as string
xNAME
DB<6> sub NAME {42} # sub declaration
DB<7> print "x".NAME # bareword now known to be s
+ub
x42
DB<8> print "x".NAME2() # explicit sub call
Undefined subroutine &main::NAME2 called at (eval 17)[C:/Perl_524/lib/
+perl5db.pl:737] line 2.
DB<9> print "x".&NAME2 # explicit sub call
Undefined subroutine &main::NAME2 called at (eval 18)[C:/Perl_524/lib/
+perl5db.pl:737] line 2.
DB<10>
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