This challenge involves creating or parsing pictures using text characters as the paint. Typically this uses only 95 printable (from a total of 128) characters defined by the ASCII Standard from 1963.
This makes it clear that "ASCII" here refers to the original 128 characters, and not to one of the various 256 character extensions. However, the tag is sometimes applied to challenges which are more general "text art", using characters not found in the original 128. In general, we may have challenges that use text from a wider set, perhaps some subset of unicode.
The tag text-art was proposed in chat. Would it be useful to have a broader tag? Is this a good candidate for such a tag? Should this replace ascii-art or accompany it, like math accompanies arithmetic? Should the ascii-art tag wiki be extended to include general text art in addition to strict ASCII? Is there some other word that sums up the whole set of letters, numbers and graphical characters better than "text"?