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1 omphaloskepsis - Contemplation of one's navel as an aid to meditation.  navel, umbilicus, belly button, omphalodium - The navel is also the umbilicus, belly button, or omphalodium; navel and umbilicus share the same Indo-European root.
Navel lint (also known by names such as navel fluff, belly button lint, belly button fluff, and dip lint) is an accumulation of fluffy fibers in the navel cavity. Many people find that, at the beginning and end of the day, a small lump of fluff has appeared in the navel cavity.