To me, the thinking face and thought balloon emoji combo signify the act of thinking deeply and introspectively. The thinking face emoji has a hand on its chin and a contemplative expression, while the thought balloon emoji appears above its head, representing the thoughts that are swirling around in the mind.
Together, these emojis suggest the idea of engaging in deep thinking or reflection. They can be used to convey a sense of pondering, introspection, or trying to come up with an idea or solution to a problem. They may also suggest a state of confusion or uncertainty, as if one is contemplating various possibilities or trying to make sense of something.
Overall, the thinking face and thought balloon emoji combo can be a powerful visual representation of the process of thinking and reflecting, and they are often used to convey a sense of thoughtfulness, curiosity, and introspection.