math mode - Dot with only operator overline - TeX - LaTeX Stack Exchange
TeX and Typography on X: "It's easier to see \overline than \bar, especially in exponents. \text{overline }x^{\overline{n}} \text{ vs. bar } x^{\bar{n}} https://t.co/pGNmxP6OYn" / X
math mode - Kindly increase the gap size in an array (between the \overline and the top line) - TeX - LaTeX Stack Exchange