Abbreviations
- Dy, the chemical symbol for Dysprosium, the 66th chemical element
- Dy., an abbreviation for Deputy
- dy, the mathematical notation for the differential of the common variable y
- The DY postcode area in Britain
- DY, the IATA airline designator for Norwegian Air Shuttle
- DY, former IATA airline designator for Alyemda, a Yemeni airline
- DY or Daddy Yankee, Reggaeton Singer's clothing line
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