Double may refer to:
- Multiplication by 2
- Double precision, a floating-point representation of numbers that is typically 64 bits in length
- A split-complex number of the form $ x+yj $, where $ j^2=+1 $
- A 2-tuple, or ordered list of two elements, denoted $ (a,b) $
- Double (manifold)
- Double (Java), a type of variable which supports decimals (such as 5.01, 0.75, -5.250), whereas integers only support whole numbers
See also 
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