Triangular ruler

Japanese: 三角定規 - さんかくじょうぎ
Triangular ruler
〘 noun 〙 A ruler that forms a triangle. Usually, there are two types in a set: one with triangles of 60 degrees, 30 degrees, and 90 degrees, and the other with triangles of 45 degrees, 45 degrees, and 90 degrees. ※Social Gathering (1909)〈Mori Ogai〉 "It ended up looking just like a triangle set block standing upside down."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 三角形をなす定規。通例、六〇度・三〇度・九〇度の三角を有するものと、四五度・四五度・九〇度の三角を有するものの二種を一組とする。※懇親会(1909)〈森鴎外〉「丁度三角定木を倒に立てたやうな形になった」

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