Pop-It Toys are silicone sheets with half-spherical dimples arranged side by side. You can press these dimples upward, creating bumps. When arranged at right angles, they can also represent enlarged Braille characters.
On a sheet with 6×5 points, 3 characters go side by side, and 2 characters are stacked on top of each other. For example, check out the products: KICOSOADT Pop it, popit XXL Toys, Rainbow Pop It Toy, Push Pop Bubble
In the case of the following 5 pendants, 3 of them together form a Braille pattern of 6 dots each, available on Amazon.