弐

1. Origins, structure, and basic meaning

• Structure: 弐 (に) is the formal anti-alteration numeral for two, used in documents and amounts.
• Basic usage: It appears on old certificates or receipts where ordinary 二 could be more easily changed.

2. Common pitfalls and similar expressions

• Formal form, same numeric value
  • 弐 still means two; it differs from 二 in register and document function, not in quantity.