印

1. Origins, structure, and basic meaning

• Structure: 印 is read しるし here and means either a visible mark or a token carrying symbolic meaning.
• Basic usage: It can be a red mark showing where to make a correction or matching ornaments kept as a sign of friendship.

2. Common pitfalls and similar expressions

• A visible mark and a token of relationship
  • It can be a red mark identifying a correction or matching ornaments serving as a token of friendship. The latter symbolizes a relationship rather than indicating a location.