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Perl : meaning of ||= symbol

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http://www.unix.com – While going through the below perl code, there is a line which contains Code: $sheet -> {MaxRow} ||= $sheet -> {MinRow}; Could anyone please explain the meaning of ||= and where it is used complete code --------------- Code: foreach my $sheet (@{$excel -> {Worksheet}}) {           printf("Sheet: %s\n", $sheet->{Name});                 $sheet -> {MaxRow} ||= $sheet -> {MinRow};                 foreach my $row ($sheet -> {MinRow} .. $sheet -> (HowTos)