The Kindle app, which is available on devices including e-ink screens, iPhones, and Mac computers, has been known to have issues displaying certain characters, such as mathematical formulae. For example, the formula should be displayed as O(log n), O(1), but instead appears as an unusual font that looks like italics. This peculiarity is likely related to font issues. Have any V users encountered similar problems? The issue may be due to the use of a particular font, and it is worth exploring this further to find a solution.