From:http://www.macissues.com/2015/11/05/how-to-create-a-quick-ascii-banner-in-the-os-x-terminal/

Even if you are not a Terminal wizard, there are some fun tools and features of it that can be amusing. For instance, some online services are available for you to log into with Telnet and watch a text-based version of Star Wars, or you can play odd games that folks have coded into the “emacs” editor, among others. If you are ever sitting at your Mac and suddenly have the urge to print out a massive banner of a text phrase, then you can do that to.

First, open the Terminal, then type the following:

banner "MacIssues"

This will create a vertical banner in hash characters of the word “MacIssues” and you can change the text to whatever you would like, to have a banner of that printed. By default this will output to the Terminal window, but you can quickly route the output to a TextEdit document by piping the output with the following approach:

banner "MacIssues" | open -fe

In the text document that opens, if the banner appears garbles, then resize the window until the message is accommodated, and then print to whatever printer you have.

Granted there are plenty of free tools or those in common word processing and design programs that can do this, and often with greater style (drop shadows, colors, fonts, etc.); however, this is a quick way to punch out a banner on pretty much any Mac, at any time. Note that being a Terminal-based option, this approach is doable on many other Unix and Linux distributions as well, so if you’re ever indulging in your geek side and suddenly have the urge to make a banner, this is likely how you would do it.