I try to register @null wherever I go. Most places don't allow it, and the one place that did force changed the name at one point.
https://www.wired.com/story/null-license-plate-landed-one-ha...
llOlllO_lllOlOl_llOllOOl_llOllOO
relevant XKCD
Other relevant XKCD
Explaining the joke: The first letter is ain, written as a3 or 'a in some places. Pronounce a' with a soft stop. Because of this, legal names here sometimes include an apostrophe. Normally it's spelled 'Ainul, but one can misspell it.
As in, pointer...