{{wiktionary|dy|d.y.}} '''DY''', '''D. Y.''', '''Dy''', or '''dy''' may refer to: {{TOC right}} ==Science and technology== * {{mvar|dy}}, Leibniz's notation for the differential of a variable ''y'' * Dysprosium (symbol Dy), a chemical element * 1,4-Dioxane, a solvent
===Astronomy=== * DY Persei, a variable star in the Perseus constellation * DY Persei variable, a subclass of R Coronae Borealis variables * DY Eridani, a triple star system less than 16.5 light years away from Earth
==Businesses== * Norwegian Air Shuttle (IATA code: DY) * Alyemda (former IATA code: DY), a former Yemeni airline * DY, clothing brand of singer Daddy Yankee
==People== * Dy (surname), a surname in various cultures (including a list of people with the surname) * DY (rapper) (born 1984), Canadian rapper * DY, member of the American record production and songwriting team 808 Mafia * Lady Di, Diana, Princess of Wales
==Places== * DY, the official International vehicle registration code for Benin (formerly Dahomey) * DY postcode area, in England * DY Patil Stadium, a cricket stadium in India * D. Y. Patil college of Engineering and Technology, Kolhapur, in India
==Other uses== * dy (digraph), a digraph used in rendering the Xhosa and Shona languages, as well as some Australian Aboriginal languages such as Warlpiri * Deputy (disambiguation) * DY, a line of clothing from Puerto Rican singer Daddy Yankee
==See also== * Dee Why, a suburb in Sydney, Australia * Die (disambiguation) * Dye (disambiguation) * YD (disambiguation)
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