center square
From Wiktionary, the free dictionary
combined with the rule the piece on the lower right forms a center square
Alternative forms
Noun
center square (plural center squares) (American spelling)
- A tool used to find the center of a circle, consisting of two perpendicular straight-edges, both placed tangent to the circular piece, and a third straight-edge which bisects the angle between the other two.
Anagrams
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