In the USA, rectangular slices of pizza are often called "Sicilian pizza". It is frequent as a school cafeteria lunch dish, a packaged frozen dish, and a pizzeria menu option.
In Israel, calling rectangular pizza "Siclian pizza" could seem problematic since it might not automatically be understood as USA rectangular pizza.
Well, מָתֶמָטִיקַאי אוֹכֵל רַק גִּזְרַת פִּ֫יצָה a mathematician only eats a sector of a pizza. גִּזְרָה is also used for a designated area: אֵין בְּעָיוֹת בְּגִזְרַת־הֶחָלָל שֶׁאַ֫נוּ מְסַיּירִים בָּהּ כָּעֵת there is no trouble in the space sector we are patrolling now.