円

1. Origins, structure, and basic meaning

• Structure: 円, read えん, is a single noun with two modern uses: a circular shape and the Japanese currency unit.
• Basic usage: 百円 is the Japanese currency unit, while 円を描く means a circle.

2. Common pitfalls and similar expressions

• Distinguishing meanings
  • With the same spelling and reading, a preceding price or numeral signals currency, while drawing or radius context signals the shape.