What do a.m. and p.m. stand for?

parallel rulers

plural noun
a pair of straightedges connected by two pivoted crosspieces of equal length so as to be parallel at all times, used for various navigational purposes, especially for transferring the bearing of a plotted course to a compass rose.
Origin of parallel rulers
1695-1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for parallel rulers
  • parallel rulers are two rulers connected by linkages that keep their edges parallel.
  • Bronte brought his charts, parallel rulers, dividers and other navigation aids.

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