313 area code is almost exclusive to the City of Detroit which gives it its punch. Its cred got a big boost from the movie 8 Mile where is it figured in a rap battle scene, I forget exactly. Something about Eminem being form the 810 not the 313.
What's super hot now, of course, are the bazillions of versions of the olde English D. It always has been the most iconic Detroit symbol. While it originates from the Detroit Tigers, the fact that it is a long-established common font and therefore probably public domain allows its fair use without trademark infringement.
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