Answer:
I have never actually seen a zigzag ruler, but I would assume to make zigzag lines.
Explanation:
They are called feretilty figures.
They were: Nerva, Trajan, Hadrian, Antonius Pius, and Marcus Aurelius. Although their rules were all unique in their own ways, they are most remembered for two main things. First, the Five Good Emperors brought relative peace and prosperity to Rome.
