That's great if you're Mr. Spock and the rest of the world is a bunch of Vulcans who can control their brains in the most logical way. But human beings create connections in their brains, and the whole purpose of symbols is to create a connection.

If you use a symbol that has a particular widespread meaning, then people are going to think of that meaning when you use the symbol, even if they then figure out what you really mean a second or two later.

That's why companies trademark logos, and why other companies trying to associate themselves with those companies try to make their logos look similar. (Think of all the knock-off Starbucks-themed coffee shops around the world.)