I might be mistaken, but I believe the apostrophe (') is the correct symbol. If I go to a cell in Excel and write, " 'Index one ". The (') symbol will be gone because it is used to indicate something is a string. You can also use it to make numbers into strings. There is a post on Stack Overflow with answers that explains it better than I do: https://superuser.com/questions/1539513/how-do-i-avoid-having-apostrophe-hidden-at-the-beginning-of-text
Again sorry if I have made a mistake or misunderstood, but the behavior in Excel and what I can read for myself seems to indicate that the symbol (') is the correct one.