What does the word "Estigfend" mean?

I found the Word "Estigfend" when I copied and pasted a google Classroom assignment into google Docs. I did not see it anywhere in the actual assignment, but in the document, it was below the Word "Assigned." I google searched "Estigfend" and found one result pertaining to somebody wanting to know the Word "Estigfend," which they also found on Classroom; it was unanswered. All other search results came up with either advertisements for google Classroom or definitions of the Word "assigned."