Ruler

Also known as: 定規

An instrument used in mathematics and engineering to measure distances or to draw perfectly straight lines.

A ruler is usually relatively short. See Measuring Stick for long rulers.

See also

• Caliper
• Compass (Instrument)
• Measuring Stick
• Protractor
• Set Square
• Steel Square
• Straightedge
• T-Square
• Tape Measure
• Holding Ruler