Umbilicus may refer to:
*The
navel
The navel (clinically known as the umbilicus, commonly known as the belly button or tummy button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord. All placental mammals have a navel, although ...
or belly button
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Umbilicus (mollusc)
The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) si ...
, a feature of gastropod, Nautilus and Ammonite shell anatomy
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''Umbilicus'' (plant), a genus of over ninety species of perennial flowering plants
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Umbilicus urbis Romae
The ''Umbilicus Urbis Romae'' ()—"Navel of the City of Rome"—was the symbolic centre of the city from which, and to which, all distances in Ancient Rome were measured. It was situated in the Roman Forum where its remnants can still be seen. Th ...
, the designated center of the city of Rome from which and to which all distances in Rome and the Roman Empire were measured
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Umbilicus mundi, or "the world's navel", a Greek artifact
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