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Wikipedia definition
1. BiconeA bicone or dicone is the three-dimensional geometric shape swept by revolving an isosceles triangle around its edge of unequal length. Alternatively, one can view a bicone as the surface created by joining two identical right circular cones base-to-base.
Read “Bicone” on English Wikipedia
Read “双円錐” on Japanese Wikipedia
Read “Bicone” on DBpedia

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