Chitarra means guitar in Italian, and it is also the name for a piece of pasta-making equipment that resembles that stringed instrument (although zither would be a better match).
Maccheroni alla chitarra or
spaghetti alla chitarra are made by pressing a thin sheet of egg dough onto the metal strings, thus cutting the dough into strands (duh).
The resulting strand pasta is squarish in cross-section and roughish
in texture--as opposed to the roundish cross-section and smooth
texture you get from pasta strands that have been extruded through a
round hole. It is said that the rougher edges of the
chitarra-cut strands allow pasta sauce to cling better.

OK, enough food blah-blah. Here's the cool thing: The
chitarra shown at left is handmade in
this
country (Pennsylvania, to be exact) by an artisan who has been making
them for over 60 years. It has a hardwood frame and steel wires set into
cast-aluminum anchors; it costs $50 from
Fantes Kitchen Wares Shop.
Now, for you DIY folks: Here's a little instructional from a math professor at Columbia University in NYC on
how to build your own chitarra.