The Jargon File (version 4.4.7, 29 Dec 2003):
ASCII art
 n.
    The fine art of drawing diagrams using the ASCII character set (mainly |,
    -, /, \, and +). Also known as character graphics or ASCII graphics; see
    also boxology. Here is a serious example:
        o----)||(--+--|<----+   +---------o + D O
          L  )||(  |        |   |             C U
        A I  )||(  +-->|-+  |   +-\/\/-+--o -   T
        C N  )||(        |  |   |      |        P
          E  )||(  +-->|-+--)---+--|(--+-o      U
             )||(  |        |          | GND    T
        o----)||(--+--|<----+----------+
        A power supply consisting of a full wave rectifier circuit
        feeding a capacitor input filter circuit
    And here are some very silly examples:
      |\/\/\/|     ____/|              ___    |\_/|    ___
      |      |     \ o.O|   ACK!      /   \_  |` '|  _/   \
      |      |      =(_)=  THPHTH!   /      \/     \/      \
      | (o)(o)        U             /                       \
      C      _)  (__)                \/\/\/\  _____  /\/\/\/
      | ,___|    (oo)                       \/     \/
      |   /       \/-------\         U                  (__)
     /____\        ||     | \    /---V  `v'-            oo )
    /      \       ||---W||  *  * |--|   || |`.         |_/\
                   //-o-\\
            ____---=======---____
        ====___\   /.. ..\   /___====      Klingons rule OK!
      //        ---\__O__/---        \\
      \_\                           /_/
    There is an important subgenre of ASCII art that puns on the standard
    character names in the fashion of a rebus.
    +--------------------------------------------------------+
    |      ^^^^^^^^^^^^                                      |
    | ^^^^^^^^^^^            ^^^^^^^^^                       |
    |                 ^^^^^^^^^^^^^            ^^^^^^^^^^^^^ |
    |        ^^^^^^^         B       ^^^^^^^^^               |
    |  ^^^^^^^^^          ^^^            ^^^^^^^^^^^^^^      |
    +--------------------------------------------------------+
                 " A Bee in the Carrot Patch "
    Within humorous ASCII art, there is for some reason an entire flourishing
    subgenre of pictures of silly cows. Four of these are reproduced in the
    examples above, here are three more:
             (__)              (__)              (__)
             (\/)              ($$)              (**)
      /-------\/        /-------\/        /-------\/
     / | 666 ||        / |=====||        / |     ||
    *  ||----||       *  ||----||       *  ||----||
       ~~    ~~          ~~    ~~          ~~    ~~
    Satanic cow    This cow is a Yuppie   Cow in love
    Finally, here's a magnificent example of ASCII art depicting an Edwardian
    train station in Dunedin, New Zealand:
                                      .-.
                                     /___\
                                     |___|
                                     |]_[|
                                     / I \
                                  JL/  |  \JL
       .-.                    i   ()   |   ()   i                    .-.
       |_|     .^.           /_\  LJ=======LJ  /_\           .^.     |_|
    ._/___\._./___\_._._._._.L_J_/.-.     .-.\_L_J._._._._._/___\._./___\._._._
           ., |-,-| .,       L_J  |_| [I] |_|  L_J       ., |-,-| .,        .,
           JL |-O-| JL       L_J%%%%%%%%%%%%%%%L_J       JL |-O-| JL        JL
    IIIIII_HH_'-'-'_HH_IIIIII|_|=======H=======|_|IIIIII_HH_'-'-'_HH_IIIIII_HH_
    -------[]-------[]-------[_]----\.=I=./----[_]-------[]-------[]--------[]-
     _/\_  ||\\_I_//||  _/\_ [_] []_/_L_J_\_[] [_] _/\_  ||\\_I_//||  _/\_  ||\
     |__|  ||=/_|_\=||  |__|_|_|   _L_L_J_J_   |_|_|__|  ||=/_|_\=||  |__|  ||-
     |__|  |||__|__|||  |__[___]__--__===__--__[___]__|  |||__|__|||  |__|  |||
    IIIIIII[_]IIIII[_]IIIIIL___J__II__|_|__II__L___JIIIII[_]IIIII[_]IIIIIIII[_]
     \_I_/ [_]\_I_/[_] \_I_[_]\II/[]\_\I/_/[]\II/[_]\_I_/ [_]\_I_/[_] \_I_/ [_]
    ./   \.L_J/   \L_J./   L_JI  I[]/     \[]I  IL_J    \.L_J/   \L_J./   \.L_J
    |     |L_J|   |L_J|    L_J|  |[]|     |[]|  |L_J     |L_J|   |L_J|     |L_J
    |_____JL_JL___JL_JL____|-||  |[]|     |[]|  ||-|_____JL_JL___JL_JL_____JL_J
    The next step beyond static tableaux in ASCII art is ASCII animation. There
    are not many large examples of this; perhaps the best known is the ASCII
    animation of the original Star Wars movie at http://www.asciimation.co.nz/.
    There is a newsgroup, alt.ascii-art, devoted to this genre; however, see
    also warlording.
The Free On-line Dictionary of Computing (30 December 2018):
ASCII art
ASCII graphics
character graphics
    (Or "character graphics", "ASCII graphics") The
   fine art of drawing diagrams using the ASCII character set
   (mainly "|-/\+").
   See also boxology.  Here is a serious example:
      o----)||(--+--|<----+   +---------o + D O
        L  )||(  |        |   |             C U
      A I  )||(  +-->|-+  |   +-\/\/-+--o -   T
      C N  )||(        |  |   |      |        P
        E  )||(  +-->|-+--)---+--)|--+-o      U
           )||(  |        |          | GND    T
      o----)||(--+--|<----+----------+
      A power supply consisting of a full wave rectifier
      circuit feeding a capacitor input filter circuit
                            Figure 1.
   And here are some very silly examples:
      |\/\/\/|     ____/|              ___    |\_/|    ___
      |      |     \ o.O|   ACK!      /   \_  |` '|  _/   \
      |      |      =(_)=  THPHTH!   /      \/     \/      \
      | (o)(o)        U             /                       \
      C      _)  (__)                \/\/\/\  _____  /\/\/\/
      | ,___|    (oo)                       \/     \/
      |   /       \/-------\         U                  (__)
     /____\        ||     | \    /---V  `v'-            oo )
    /      \       ||---W||  *  * |--|   || |`.         |_/\
   		//-o-\\
   	 ____---=======---____
        ====___\   /.. ..\   /___====      Klingons rule OK!
      //        ---\__O__/---        \\
      \_\                           /_/
   				    _____
   			    __...---'-----`---...__
   		       _===============================
     ,----------------._/'      `---..._______...---'
     (_______________||_) . .  ,--'
         /    /.---'         `/
        '--------_- - - - - _/
   	       `--------'
   			   Figure 2.
   There is an important subgenre of ASCII art that puns on the
   standard character names in the fashion of a rebus.
    +--------------------------------------------------------+
    |      ^^^^^^^^^^^^                                      |
    | ^^^^^^^^^^^            ^^^^^^^^^                       |
    |                 ^^^^^^^^^^^^^            ^^^^^^^^^^^^^ |
    |        ^^^^^^^         B       ^^^^^^^^^               |
    |  ^^^^^^^^^          ^^^            ^^^^^^^^^^^^^^      |
    +--------------------------------------------------------+
   	     "A Bee in the Carrot Patch"
                          Figure 3.
   Within humorous ASCII art, there is, for some reason, an
   entire flourishing subgenre of pictures of silly cows.  One is
   shown in Figure 2; here are three more:
   	  (__)              (__)              (__)
   	  (\/)              ($$)              (**)
      /-------\/        /-------\/        /-------\/
     / | 666 ||        / |=====||        / |     ||
    *  ||----||       *  ||----||       *  ||----||
       ~~    ~~          ~~    ~~          ~~    ~~
     Satanic cow    This cow is a Yuppie   Cow in love
   			  Figure 4.
   (http://gagme.wwa.com/~boba/scarecrow.html).
   (1996-02-06)