e7e.org
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.
The .org adds institutional weight a three-character string wouldn’t have elsewhere. Short plus .org is the shape established bodies use, and the ordinary combinations disappeared decades ago.
Symmetrical, short, and there is exactly one of it. Enquiries welcome.