Heta

Blend of "header" and "metadata".
Also, happens to be an archaic local variant of a greek letter: ͱ

Heta is the part of a file before the first "empty line".

"Empty line" in this context can mostly be thought of as the character sequence "\n\n".

Note: By implication, Heta can never end with a '\n' character and it can never contain the character sequence "\n\n".

If a file begins with the character "\n", its Heta is empty.

Else, if a file does not contain the character sequence "\n\n", it is all Heta.

mdata

ͱdata, or hdata, pronounced "hetadata", is Heta in mdata format.

Also known as "Mdata Heta".