(1) TYPED DRAWING
(2) DESIGN ONLY
(3) DESIGN PLUS WORDS, LETTERS, AND/OR NUMBERS
(4) STANDARD CHARACTER MARK
(5) WORDS, LETTERS, AND/OR NUMBERS IN STYLIZED FORM
(6) FOR SITUATIONS FOR WHICH NO DRAWING IS POSSIBLE, SUCH AS SOUND
Number 6 is an interesting code. The search (6)[md] pulls up a surprisingly low 317 records. But it does turn up some familiar tones, such as the registrations for the Intel chimes, which "consists of a five tone audio progression of the notes D FLAT, D FLAT, G, D FLAT and A FLAT," and the ESPN chimes, which "consists of the following six musical notes played in a fast tempo: "D, C sharp, D, D, C sharp, D"."
I expect that the popularity of ring tones may vary well increase the number of marks with the No. 6 mark drawing code. Here's two ring tone applications: the sound of a childlike human giggle and THE SOUND OF A GOLF CLUB HITTING A GOLF BALL, THE SOUND OF THE GOLF BALL LANDING ON A PUTTING GREEN, AND THE SOUND OF THE GOLF BALL FALLING INTO THE CUP.
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