Ruler

n. governor, sovereign; flat tool used for measuring distances

This article is about the drawing and measuring instrument. Ruler can also refer to a statesman in charge or ceremonial head of state of a country or minor politically significant principality; for this meaning see Monarch or Lists of incumbents. A ruler or rule is an instrument used in geometry, technical drawing and engineering/building to measure distances and/or to rule straight lines. Strictly speaking, the ruler is the instrument used to rule lines and the calibrated instrument used for determining measurement is called a measure. However, common usage is that a ruler is calibrated so that it can measure.
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Noun
1. measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths
(synonym) rule
(hypernym) measuring stick, measure, measuring rod
(hyponym) carpenter's rule
(derivation) rule
2. a person who rules or commands; "swayer of the universe"
(synonym) swayer
(hypernym) person, individual, someone, somebody, mortal, human, soul
(hyponym) Inca
(derivation) govern, rule

(n.)
One who rules; one who exercises sway or authority; a governor.
  

(n.)
A straight or curved strip of wood, metal, etc., with a smooth edge, used for guiding a pen or pencil in drawing lines. Cf. Rule, n., 7 (a).
  

zhou1 guan1 fang4 huo3
The magistrate sets fire.
Describing rude and unreasonable rulers.

ke1 zheng4 meng3 yu2 hu3
A tyrant's government is more fearful than tigers.
(No further explanation)