ASCII art is the process of using the 95 printable characters defined by the ASCII Standard for creating artistic graphics or visual effects.
ASCII art is sometimes used for digital marketing. The goals of using ASCII art in digital marketing communications are to provoke emotion, to help memorization and to stand out by breaking codes.
First and more frequent uses of ASCII art in webmarketing were probably within email signatures when text version was the norm. It was sometimes used for company email signatures but more often for personal branding.
ASCII art has been sometimes used for AdWords PPC campaigns before Google punctuation filters limited the possibilities.
An old awarded european AdWords campaign with ASCII art :