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I think you mean Single Circulation.
It is the type of circulation, which occurs mainly in fishes. In this cicrulation, blood passes through the heart only once in each circuit of the body.

double circulatory system is a which system refers to two distinct and separate circulatory pathways for blood flow.
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The circulation of animals two types of circulations 
1)single circulation ; it means that the blood which flows through the heart only once is called single circulation
Eg; fish
2)double circulation; it means that the blood which flows through the heart twice is called double circulation
Eg; humanbeings and all mamals
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