zigzag rule

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noun
  1. a rule composed of light strips of wood joined by rivets so as to be foldable, all the opening and closing parts being in parallel planes.
Also called folding rule.

folding rule

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for folding rule

yardstick, rule, measure, straightedge, T-square