If you're looking for an indentation or opening in something, you're looking for a cleft (noun). A person with a cleft (adjective) chin has a little dent in the middle of their chin. Most superheroes have one.

Superman is known for his ability to leap tall buildings, his crush on Lois Lane, and the cleft in his chin. For some reason, that cleft is supposed to make him look strong. Some clefts are not so nice. A cleft palate is an upper lip with a deep indentation in it that should be fixed by a surgeon. You may know the verb cleave, which means to cut down the middle. If you cleave something but don't finish the job, you've probably left a cleft in it.

Definitions of cleft
  1. noun
    a long narrow opening
    synonyms: crack, crevice, fissure, scissure
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    a crack in a lip caused usually by cold
    a narrow opening as e.g. between planks in a wall
    a deep fissure
    fatigue crack
    a crack in metal resulting from metal fatigue
    break, fault, faulting, fracture, geological fault, shift
    (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
    a narrow fissure in rock
    a narrow fissure
    a lengthwise crack in wood
    vent, volcano
    a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
    inclined fault
    a geological fault in which one side is above the other
    strike-slip fault
    a geological fault in which one of the adjacent surfaces appears to have moved horizontally
    type of:
    gap, opening
    an open or empty space in or between things
  2. noun
    a split or indentation in something (as the palate or chin)
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    type of:
    indentation, indenture
    a concave cut into a surface or edge (as in a coastline)
  3. adjective
    split or divided
  4. adjective
    having one or more incisions reaching nearly to the midrib
    synonyms: dissected
    composed of more than one part
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