771 is the decimal code for the HTML Entity described as “COMBINING TILDE” or “NON-SPACING TILDE”. It is part of the Unicode range of “Combining Diacritical Marks”.
Here is from
http://wordfaqs.mvps.org/combinecharacters.htm:
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Another subset that may be useful is the Combining Diacritical Marks subset. The characters in this subset are designed to combine with whatever character is inserted immediately after them. Run-of-the-mill fonts include combining forms of the grave and acute accents, tilde, hook above, and dot below (Arial Unicode MS includes many more). There is no advantage to using these in preference to combined forms of letters that already have these accents, but they can be useful in combination with letters that don’t normally have them. For example, the font may include ã and ñ, but if you want to put a tilde over some other letter, then you can use the Combining Tilde. Note that ordinarily you must type the combining character first, then the diacritical mark from the Insert | Symbol dialog.
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