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to("call" subroutines but "invoke" methods, since it sounds cooler.=item I/OInput from, or output to, a L</file> or L</device>.=item IOAn internal I/O object. Can also mean L</indirect object>.=item IPInternet Protocol, or Intellectual Property.=item IPCInterprocess Communication.=item is-aA relationship between two L<objects|/object> in which one object isconsidered to be a more specific version of the other, generic object:"A camel is a mammal." Since the generic object really only exists ina Platonic sense, we usually add a little abstraction to the notion ofobjects and think of the relationship as being between a genericL</base class> and a specific L</derived class>. Oddly enough,Platonic classes don't always have Platonic relationships--seeL</inheritance>.=item iterationDoing something repeatedly.=item iteratorA special programming gizmo that keeps track of where you are insomething that you're trying to iterate over. The C<foreach> loop inPerl contains an iterator; so does a hash, allowing you toL<each|perlfunc/each> through it.=item IVThe integer four, not to be confused with six, Tom's favorite editor.IV also means an internal Integer Value of the type a L</scalar> canhold, not to be confused with an L</NV>.=back=head2 J=over 4=item JAPH"Just Another Perl Hacker," a clever but cryptic bit of Perl code thatwhen executed, evaluates to that string. Often used to illustrate aparticular Perl feature, and something of an ongoing Obfuscated PerlContest seen in Usenix signatures.=back=head2 K=over 4=item keyThe string index to a L</hash>, used to look up the L</value>associated with that key.=item keywordSee L</reserved words>.=back=head2 L=over 4=item labelA name you give to a L</statement> so that you can talk about thatstatement elsewhere in the program.=item lazinessThe quality that makes you go to great effort to reduce overall energyexpenditure. It makes you write labor-saving programs that otherpeople will find useful, and document what you wrote so you don't haveto answer so many questions about it. Hence, the first great virtueof a programmer. Also hence, this book. See also L</impatience> andL</hubris>.=item left shiftA L</bit shift> that multiplies the number by some power of 2.=item leftmost longestThe preference of the L</regular expression> engine to match theleftmost occurrence of a L</pattern>, then given a position at which amatch will occur, the preference for the longest match (presuming theuse of a L</greedy> quantifier)
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