asterisms

/AE1 S T ER0 IH0 Z AH0 M Z/
noun
  1. 1

    (constellation) An unofficial constellation (small group of stars that forms a visible pattern).

    โ€œThe Big Dipper, Summer Triangle, and Orion's Belt are asterisms.โ€

  2. 2

    A rarely used typographical symbol (โ‚, three asterisks arranged in a triangle), used to call attention to a passage or to separate subchapters in a book.

  3. 3

    A star-shaped figure exhibited by some crystals by reflected light (as in a star sapphire) or by transmitted light (as in some mica).

Source: https://en.wiktionary.org/wiki/asterism, https://en.wiktionary.org/wiki/asterisms