It doesn't matter if the symbol is "universally recognized". It's still a symbol. That's like saying you shouldn't get a ticket for speeding because so many people do it. You still get the ticket. But in this case, you can't flirt or cry your way out of a DQ.
I see what you're saying, but your comparison is off. In the case of the ticket, it's known that it is against the law to speed. What we're debating isn't whether or not we should be penalized for using x, but whether it's against the rules in the first place. Which I think it isn't. Unless you've had experience with getting points off for that, in which case I guess it might be.
2015 events: WIDI, Protein Modeling, Geomapping, Chem Lab
2014 events: WIDI, Geomapping, Materials Science, Food Science
2013 events: WIDI, Mousetrap Vehicle, Heredity, Food Science, Metric Mastery
Best ever place: Nationals, 3rd in WIDI