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A filled square.

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1. Introduces items in a list.
   • 2007, Gloria G. Mayer, Michael Villaire, Health Literacy in Primary Care: A Clinician’s Guide (in English), Springer Publishing, →ISBN, page 197:

     Remember these points when using a vertical list:
     ■ Introduce the list with a sentence that explains what you are listing.
     ■ Indent the list.
     ■ Use left justification so that your bullets or numbers line up directly under one another.

   • 2009, Pat Francis, Inspiring Writing in Art and Design: Taking a Line for a Write (in English), Intellect Books, →ISBN, page 152:

     ■ do not turn the postcard over to reveal the written side
     ■ don’t spend ages choosing a card – just take any one
     ■ look at the picture
     ■ then write on a piece of paper using the following questions as stimuli
     ■ you can jot words down or use full sentences – it doesn’t matter.

   • 2012, Heather Graves, Roger Graves, A Strategic Guide to Technical Communication, 2nd edition (in English), Broadview Press, →ISBN, page 133:

     There are three main reasons to switch to flashing rather than shingling through the gutter:
     ■ Ice dams in the winter cannot penetrate the metal flashing or cause leaking.
     ■ Installation is 30% faster.
     ■ The flashing and shingle combination is more aesthetically appealing.

2. Indicates the end of an article.
   • 1997, "Cartman Gets an Anal Probe", season 1, episode 1 of South Park

     [disclaimer before the start of the show]

     The following program contains coarse language and due to its content it should not be viewed by anyone■

3. See ⏹ for the stop button.
4. See ∎ for the QED symbol.
5. See □ for various uses of a square outline.