Another “passive” sign that might work could be the humble white chess knight piece. In this case, it symbolizes the concept of a white knight coming to help and save others, but also because it is chess, it implies a depth of strategic, rational thinking. So for instance, an Effective Altruist might leave a white chess knight piece on their desk, and anyone familiar with what it represents could strike up a conversation about it.
Another “passive” sign that might work could be the humble white chess knight piece. In this case, it symbolizes the concept of a white knight coming to help and save others, but also because it is chess, it implies a depth of strategic, rational thinking. So for instance, an Effective Altruist might leave a white chess knight piece on their desk, and anyone familiar with what it represents could strike up a conversation about it.
Illuminati conspiranoids are so going to freak over this.