There are two problems:
- Anything that blends in easily with normal dress will also be worn by people for whom it is meaningless, resulting in lots of false positives.
- Anything more easily identifiable will stand out and draw more attention from those pesky people who always have to ask "What's that?" Then you have to explain yourself to people who don't really care what it means.
In any case, it's probably better to err in the direction of #2. It's not like there's anything wrong with accidentally having to educate someone. A symbol can easily be worn as jewelry or attached to various articles, say in the form of a pin or button. The orange band is okay, except that every color is taken for something else, and orange means MS before AS, for those who even recognize it at all.
However, a slogan or code like "Deny NT" (besides being obviously stolen) is NOT acceptable at all. You'll get nowhere by telling people what amounts to "We don't like you because you're not one of us." Nothing will be accomplished through exclusivity. Any verbal signal should fulfill two criteria:
- Acknowledge an understanding, likeness, or tolerance between and about the people who use/recognize it
- Sound unoffensive and in fact totally uninteresting so as not to be a distraction
If you come to define yourself according to some secret handshake (and this is exactly what we're talking about), you'll turn into a bunch of boring people who just shake hands and pat each other on the back for knowing the secret handshake. Then everybody else will hate you because you're hedged up in a group that nobody knows or cares about. Kind of like the high school cliques that
you hated. Remember those?
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"If knowledge can create problems, it is not through ignorance that we can solve them." - Isaac Asimov