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Which type of carbon-carbon bond occurs in an alkyne?

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structures of common hydrocarbon compounds — hydrocarbon Structures assumed by hydrogen (H) and carbon (C) molecules in four common hydrocarbon compounds.

An alkyne is characterized by the presence of a carbon-carbon triple bond.12

This triple bond consists of one $σ$ (sigma) bond and two $π$ (pi) bonds. These bonds are formed when two carbon atoms share three pairs of electrons. Structurally, the atoms involved in a triple bond lie in a linear arrangement, and the $π$ bonds create regions of increased electron density parallel to the bond axis. While these triple bonds are very strong, they are reactive because the $π$ bonds can be broken to form stronger $σ$ bonds.341