Coaxial

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For weapons, see Coaxial weapon.

In geometry, coaxial means that two or more forms which share a common axis; it is the three-dimensional linear analog of "concentric".

Coaxial cable, as a common example, has a wire conductor in the center (D) a circumferential outer conductor (B) and an insulator (C) separating these two conductors. The outer conductor is usually sheathed in a protective outer jacket (A).

The dimension and material of the conductors and insulation determine the cables characteristic impedance and attenuation at various frequencies.