A saber is a large, speedy military vehicle with big knobby tires, armed with a gauss cannon and capable of holding four armored soldiers. It was used in the Guild Wars.
Some sabers were used as "saber command cars".
Dietz, William C. (April 6, 2010). StarCraft II: Heaven's Devils. Simon & Schuster (Gallery Books). ISBN 978-1-4165-5084-6