The term "iceberg" is not commonly used in the context of quantum mechanics. However, if you are referring to a metaphorical representation of the deeper underlying aspects of quantum mechanics that are not immediately evident, there are a few possible interpretations.
One interpretation is the idea that the observable phenomena and equations of quantum mechanics represent only a small visible portion of a much larger and more complex theoretical framework. Quantum mechanics is a mathematical formalism that describes the behavior of particles at the microscopic level, but it is built upon deeper principles and mathematical structures. These underlying aspects, which include concepts like wave-particle duality, superposition, entanglement, and the probabilistic nature of measurement outcomes, can be seen as the "hidden" or "unseen" part of the iceberg, while the observable effects are the visible part.
Another interpretation of the "iceberg" metaphor in quantum mechanics could be related to the idea that quantum mechanics challenges our intuitive understanding of reality. Many of the concepts in quantum mechanics, such as particles existing in multiple states simultaneously or the non-local connections between entangled particles, go against our everyday experience and classical intuitions. These counterintuitive aspects are often referred to as the "weirdness" of quantum mechanics. In this interpretation, the iceberg represents the vast territory of quantum phenomena and concepts that lie beneath the surface of our classical understanding, waiting to be explored.
It's worth noting that the metaphorical use of "iceberg" is not a standard term or concept in the field of quantum mechanics itself. Instead, it is a way of visualizing the depth and complexity of the subject and the aspects that may not be immediately apparent to someone first encountering quantum mechanics.