"Pin" 在英語中可以表示多種意思，包括：
1. 針：a small pointed object used for fastening or fixing things together, typically made of metal.
2. 引子、觸發器：an action, event, or factor that causes something to happen or to begin.
3. 資格証明：a small metal device worn on clothing as a symbol of membership or authority.
具體含義取決於
中國
數據來源：美國社會保障侷 (SSA)