Biang from Biang biang noodles is also fairly complex (though not supported by Unicode)

And actually it is in the Arabic "name of God," thanks!

https://en.wiktionary.org/wiki/%D8%A8%D8%B3%D9%85_%D8%A7%D9%...

I didn't know there's a whole ligature as a single code point U+FDFD available, thanks sscotth. The code point is also easy to remember.

(It, accidentally, also most probably represents the words first said by the Orlando shooter when calling 911, when the translation in the transcription is compared.)

Is this the biggest glyph in Unicode?