Umbilicus

Umbilicus may refer to:
*umbilicus, a feature of gastropod, Nautilus and Ammonite shell anatomy
*umbilicus, a synonym for the navel or belly button.
*"Umbilicus", a genus of over ninety species of perennial flowering plants, including:
**"Umbilicus rupestris", the binomial name for navelwort.
**"Umbilicus horizontalis", the binomial name for horizontal navelwort.
**"Umbilicus intermedius", the binomial name for intermediate navelwort.
**"Umbilicus chrysanthus", the binomial name for Venus' navel.
**"Umbilicus chloranthus", the binomial name for green Venus' navel.
**"Umbilicus erectus", the binomial name for reniform Venus' navel.
**"Umbilicus oppositifolius", the binomial name for gold drop.
*Umbilicus urbis Romae, the designated center of the city of Rome from which and to which all distances in Rome and the Roman Empire were measured.
*umbilicus mundi, or "the world's navel", a Greek artifact.