I've found that many manpages uses the quotation : `c/s'
i.e quoting character or sting inside grave accent(`) & apostophe(').
The -H, -L and -P options control the treatment of symbolic links. Command-line arguments following these are taken to be names of files or directories to be examined, up to the first argument that begins with `-', or the argument `(' or `!'. That argument and any following arguments are taken to be the expression describing what is to be searched for. If no paths are given, the current directory is used. If no expression is given, the expression -print is used (but you should probably consider using -print0 instead, anyway).
This manual page talks about `options' within the expression list. These options control the behaviour of find but are specified immediately after the last path name. The five `real' options -H, -L, -P, -D and -O must appear before the first path name, if at all. A double dash -- can also be used to signal that any remaining arguments are not options (though ensuring that all start points begin with either `./' or `/' is generally safer if you use wildcards in the list of start points).
See the quotation used for emphasized characters. I've to use escape character () to avoid undesired formatting in above quoted text (visualize it by hitting edit button!)
So, I am curious to know about the usage of this quotation used. What is the usage of such quotation or when & why such quotation is used?