原点

1. Origins, structure, and basic meaning

• Structure: 原点, read げんてん, combines origin 原 with point 点 to denote a reference starting point.
• Basic usage: 活動の原点 is an original purpose or starting point, while 座標の原点 is the reference point of a coordinate system.

2. Common pitfalls and similar expressions

• Distinguishing meanings
  • In figurative use it means the idea or occasion serving as a present reference, not merely the first day chronologically.