Phalanx
The phalanx (IPA: /ˈfa.laŋks/; pl.: phalanges or phalanxes) was a rectangular mass military formation, usually composed entirely of heavy infantry armed with spears, pikes, sarissas, or similar polearms tightly packed together. The term is used today to describe the use of this formation in ancient Greek warfare, but ancient Greek writers used it more broadly to describe any massed infantry formation regardless of its equipment.