• Napier Deltic
  Napier Deltic
  The Napier Deltic engine is a British opposed-piston valveless, two-stroke diesel engine used in marine and locomotive applications, designed and produced by Napier & Son...
  
  , a diesel engine
  • British Rail DP1
    British Rail DP1
    DP1, known as Deltic from the name painted on the sides, is a prototype demonstrator locomotive employing a Deltic engine, built by English Electric in 1955...
    
     ("Deltic") a prototype locomotive built by English Electric fitted with the Deltic Engine
  • British Rail Class 55
    British Rail Class 55
    The British Rail Class 55 is a class of diesel locomotive built in 1961 and 1962 by English Electric. They were designed for the high-speed express passenger services on the East Coast Main Line between and Edinburgh. They gained the name "Deltic" from the prototype locomotive, DP1 Deltic, which...
    
    , production locomotives powered by Deltic engines
  • British Rail Class 23
    British Rail Class 23
    The British Rail Class 23 were a class of ten Bo-Bo diesel-electric locomotives built by the English Electric Company in 1959. The power unit used was a Napier Deltic T9-29 9-cylinder engine of driving an EE generator, which powered the four traction motors...
    
    , "Baby Deltic" production locomotives powered by Deltic engines
• Deltic acid
  Deltic acid
  Deltic acid or dihydroxycyclopropenone is a chemical substance with the chemical formula C3O2. It can be viewed as a ketone and double alcohol of cyclopropene...
  
  , a chemical whose molecular backbone resembles the Greek letter delta (Δ)

See also

• Deltics
  Deltics
  Deltics is an album by Chris Rea, released in 1979. The title is a reference to the Deltic-class locomotives that were used on the UK East Coast rail network in the 1960s and 1970s.-Track listing:All songs by Chris Rea.# "Twisted Wheel" – 05:15...
  
  , a music album by Chris Rea
  Chris Rea
  Chris Rea is an English singer-songwriter, recognisable for his distinctive, husky voice and slide guitar playing. The British Hit Singles & Albums stated that Rea was "one of the most popular UK singer-songwriters of the late 1980s. He was already a major European star by the time he finally...
  
  
• Deltoid (disambiguation)
• Deltate (disambiguation)
• River delta
  River delta
  A delta is a landform that is formed at the mouth of a river where that river flows into an ocean, sea, estuary, lake, reservoir, flat arid area, or another river. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river...
  
  
• Delta (letter)
  Delta (letter)
  Delta is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter Dalet...