双子

1. Origins, structure, and basic meaning

• Structure: 双子 (reading ふたご) is a noun for twins born from the same pregnancy or, in context, for one member of a twin pair.
• Basic usage: It is used to compare twins’ similarities and differences or to announce the birth of twin babies.

2. Common pitfalls and similar expressions

• Pair and individual
  • Context determines whether 双子 denotes both people together or one person, as clarified by 双子の一人.
• No claim of identity
  • The word itself does not mean that the twins must have identical faces, personalities, or preferences.