Navel lint (also identified by names which include navel fluff, belly button lint, belly button fluff, and dip lint) is an accumulation of fluffy fibers while in the navel cavity normally observed in the beginning and close with the working day. had been used to imply "to do well" https://elliottewtrx.suomiblog.com/discover-cotton-linters-images-hs-code-tradeindia-edition-51836291