Pex and “\0” what is the correct name for this?

Question

I am using Pex and keeps throwing "\0" at my string parameters. Through a little testing I found that it is some sort of end of string?

I am looking for the official name for this to learn more about it but google is shallowing all the white spaces of "\0" making it a 0 and end of string does not turn up much either.

Interstingly the lenght of strings are "\0" , lenght 1, display "" "\0\0" , lenght 2, display "" "1234\056709", length 10, display "1234"

thx for the hints

Answer 1

Null-terminated string

Answer 2

\0 is the escape for the NUL character.