Symmetry is easy to remember and pleasant to look at in a logo, which is why palindromic domains have their own following and their own buyers. A7A reads the same in both directions. The letter-digit-letter shape types quickly and holds its form at small sizes, which is where most names fall apart: an icon, a favicon, a badge, a stamp. With no fixed meaning attached, it goes wherever the buyer takes it.

Palindromes are remembered without effort. That is a small cognitive advantage and it applies every time someone tries to recall an address after seeing it once on a conference slide. B3B reads identically in both directions and sits visually balanced in a logo, which is harder to achieve deliberately than it sounds. The resemblance to B2B is useful at one remove. An organisation serving business gets the association without adopting an acronym so generic that thousands of entities already share it.

Longer names get compressed into illegibility at small sizes. Three symmetrical characters with the digit in the middle read correctly in an icon, a badge, a stamp and a favicon alike. E7E is palindromic, and palindromic domains have their own collectors because symmetry is pleasant to look at and easy to remember. With no fixed meaning attached, the name is entirely open: an organisation whose initials fit, a foundation wanting a compact mark, a technical body, or a project needing something short and distinctive.