Answer: hii
"Overbar (Vinculum)"
Explanation:
"a horizontal line written above a mathematical symbol to give it some special meaning."
" The vinculum can indicate a repeating decimal value: When it is not possible to format the number so that the overline is over the digit(s) that repeat, one overline character is placed to the left of the digit(s) that repeat: ‾"
Hopefully this helps you!
- Matthew