If you mean they both have the same centre - they're called 'concentric' circles.
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Concentric circles.
mandorla or vesica piscis (if they have the same radius)
Concentric circles are circles that share the same center point, with each circle surrounding the other. Eccentric circles, on the other hand, do not share the same center point and are offset from each other. In simpler terms, concentric circles are like a target with multiple rings around a common center, while eccentric circles are like two circles that are not aligned at the same center point.
congruent circles
Concentric circles