The tetrated dodecahedron is a near-miss Johnson solid. It was first discovered in 2002 by Alex Doskey. I then independently rediscovered it in 2003, and named it, not learning of Doskey’s original discovery for several years after that.
It has 28 faces: twelve regular pentagons, arranged in four panels of three pentagons each; four equilateral triangles (shown in blue); and six pairs of isosceles triangles (shown in yellow). All edges of the tetrated dodecahedron have the same length, except for the shared bases of these isosceles triangles, which are approximately 1.07 times as long as the other edges. This polyhedron has tetrahedral symmetry.
(All images here were produced using Stella 4d, which you may try for free, after downloading the trial version from this website: www.software3d.com/Stella.php.)