A ruler, sometimes called a rule, scale, line gauge, or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. Usually, the instrument is rigid and the edge itself is a straightedge ("ruled straightedge"), which additionally allows one to draw straighter lines. Rulers are an important tool in geometry, geography and mathematics. They have been used since at least 2650 BC.
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👉 Measuring stick in the context of Christian biblical canon
A biblical canon is a set of texts (also called "books") which a particular Jewish or Christian religious community regards as part of the Bible.
The English word canon comes from the Greek κανών kanōn, meaning 'rule' or 'measuring stick'. The word has been used to mean "the collection or list of books of the Bible accepted by the Christian Church as genuine and inspired" since the 14th century.
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Measuring stick in the context of Canon (canon law)
In canon law, a canon designates some law promulgated by a synod, an ecumenical council, or an individual bishop.
The word "canon" comes from the Greek kanon, which in its original usage denoted a straight rod that was later the instrument used by architects and artificers as a measuring stick for making straight lines. Kanon eventually came to mean a rule or norm, so that when the first ecumenical council—Nicaea I—was held in 325, kanon started to obtain the restricted juridical denotation of a law promulgated by a synod or ecumenical council, as well as that of an individual bishop.