pelta

noun
  1. 1

    A small shield, especially one of an approximately elliptical form, or crescent-shaped.

  2. 2

    A crescent-shaped design used in mosaics.

  3. 3

    A flat apothecium with no rim.

  4. 4

    A crescent-shaped sheet of microtubules that encircles the base of the flagella of a protozoan.

Source: https://en.wiktionary.org/wiki/pelta