Strange code on Me 110

[DB601E]

Hallo Evgeny,

i have this code from a document (NVM, WASt), and it is machine written.
So it should be T+ZH according to this document.
Of course there are often errors in these kind of documents,
so i was also thinking about and looking for different possibilities with a missing character.
?T+ZH
T?+ZH
-> without succes. I found no usefull result

Could it be something like the night-figher markings?
Perhaps the aircraft belonged to a nightfighter unit before?