元げん標ぴょう

noun

zero milestone; datum point

A fixed reference point from which distances are measured, often a marker on a road or railway. Used in surveying and civil engineering contexts.

• 日本にほん橋ばしは道どう路ろの元げん標ぴょうとして知しられている。

  Nihonbashi is known as the zero milestone for roads.

• 測そく量りょうでは、まず元げん標ぴょうを設せっ置ちする。

  In surveying, we first set up a datum point.