Double line (disambiguation)

Double line may refer to:

Double track, a type of railway involving running a track in each direction
- Double line automatic signalling, a form of railway signalling used on the majority of double track sections in New Zealand
Double-lined mackerel, Grammatorcynus bilineatus, a species of Spanish mackerel
Double-lined spectroscopic binary, a type of binary star: see Binary star#Spectroscopic binaries
Mythimna turca, common name the double line, a moth of the family Noctuidae
In algebraic geometry, a certain family of conics
In algebraic geometry, a singular line of multiplicity 2—a type of double curve

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