- 单一体 dānyītǐ unitary systema system or entity that functions as a single, unified whole
- 单一登入 dānyīdēngrù single sign-on(Taiwan) an authentication process that allows a user to access multiple applications with one set of credentials
- 单一码 dānyīmǎ Unicodestandard system for the consistent encoding and representation of text from various writing systems
- 单一税 dānyīshuì single taxA tax system where a single category of tax, such as a land value tax, provides sufficient revenue for all government spending
- 单一货币 dānyīhuòbì single currencya single currency used across multiple countries or regions