This is important because the characters are often difficult to distinguish. When you click on a character in the pallette, you will see the Unicode number (like U+0305) on the right. You can enter a combining diacritic mark (which is always entered after the base character it should apply to) in LibreOffice using Insert → Special character, check selecting “Combining Diacritical Marks” in the “Subset” menu and proceeding as usual. The following image shows the letter x, in italic, with macron, then with overline, and then, for comparison, a formula constructed as suggested in answer. But this may also depend on the font used, in practice. For those who have to use Fn key for typing the buttons, you will have to hold alt and Fn both while typing in the number. Once you release the key, the corresponding character will appear. Press and hold the alt key while you type using the numeric pad in the numerical sequence. Besides, macron is originally intended for use in linguistics (to indicate long vowel, typically), rather than part of a mathematical notation. For PC users, you need to make sure that your number lock is on. yep, overline is generally preferable here, since it is more noticeable (longer). I have to check my own e-book to see which one is better. However, you can enter such a symbol using a normal letter followed by a combining diacritic mark, which could be U+0304 COMBINING MACRON or U+0305 COMBINING OVERLINE. This is why you cannot find it in character pallettes. A symbol such as an x (lowercase or uppercase) with a line on top of it does not exist as a coded character in Unicode (or any other character code standard).
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