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Concentric objects share the same center, axis or origin. Circles, tubes, cylindrical shafts, disks, and spheres may be concentric to one another. Notice that two objects can have equal radii and be concentric and different. For example, two different meridians of a terrestrial globe are concentric and congruent, their common center is a point that represents the earth center.
Evenly spaced circles of a target used in target archery or firearms is a familiar example of concentric circles.
Concentric cable is a cable type used in TN-C-S earthing systems where the combined neutral and earth core completely surrounds the live core(s). This minimizes the risk of completely cutting through the combined neutral and earth without first completely cutting through the live cores.
Concentric muscles contractions are those in which the muscle shortens.
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