NAME

SYNOPSIS

DESCRIPTION

1. The standard way to escape a delimiter in a macro argument is to prepend a zero-width space, like this:
   The -? option displays a summary of the commands.
   Appending the zero-width space or enclosing the delimiter in double quotes works too, but isn't recommended because these methods are less commonly used:

   .Fl \&? 
   .Fl ?\& 
   .Fl "?"
       

2. If escaping is forgotten, delimiters fall out of the macros. If that leaves the macros empty, they may assume their default arguments. For example,
   .Nm [ Ar expression Cm ]
   yields
   [test expression ]
   where the square brackets are not set in bold face.