What is smaller than a planck?

Smaller than a Planck length, which is approximately (1.6 \times 10^{-35}) meters, are concepts that arise in theoretical physics, such as the idea of quantum foam or spacetime fluctuations at scales smaller than the Planck scale. However, in terms of measurable distances, the Planck length is often considered the smallest meaningful unit in current physics, beyond which classical concepts of space and time break down. Thus, while theoretical constructs may suggest smaller scales, they do not correspond to physical measurements in a conventional sense.