Hej Holger!

 HG> Yes, that is true for letters but for various other characters
 HG> the first byte is DA.

The only characters that are prefixed (start) with DA, range from U+0680 (DA80) 
to U+06BF (DABF) and are all Arabic characters (letters).

-={ ':read !echo -e "\u0680 is the same as \xda\x80"' starts }=-
ڀ is the same as ڀ
-={ ':read !echo -e "\u0680 is the same as \xda\x80"' ends }=-

The encoding gurus call it 'ARABIC LETTER BEHEH'.

Livet är gott,
Maurice

... Gråt inte för mig jag har vi.
--- GNU bash, version 5.0.2(1)-release (aarch64-raspi3b+-linux-gnu)