Someone can explain me what is "Tav"? From context I understand - player character. Right? Why Tav? I can't find information about it.
“Tav” is, in EA, the default name for our custom protagonist though we can change it. It’s derived from Gustav, who I seem to recall might be Swen Vincke’s (head of Larian’s) dog?, and from whom BG3’s code name of Project Gustav was taken.
It’s become common to refer to custom player characters as “Tav” as a result.
EDIT: And I see snowram answered while I was typing this!
