<p><strong><em>The Fifth Elephant</em></strong> is the 24th <a href="https://discworld.fandom.com/wiki/Discworld"><em>Discworld</em></a> novel by <a href="https://discworld.fandom.com/wiki/Terry_Pratchett">Terry Pratchett</a>. It introduces the <a href="https://discworld.fandom.com/wiki/Clacks">clacks</a>, a long-distance <a href="https://en.wikipedia.org/wiki/Semaphore_line">semaphore system</a>.</p>
