証券

1. Origins, structure, and basic meaning

• Structure: 証券 (しょうけん) is a financial term for securities and can also denote a security certificate.
• Basic usage: 証券という語 introduces the financial category; 証券の見本 refers to a physical certificate made as a prop.

2. Common pitfalls and similar expressions

• Financial category and paper certificate
  • The classroom context favors plural securities, while an old physical sample favors certificate.