| 
            plstring3
          ( | n , | 
| x , | |
| y , | |
| z , | |
| string ); | 
      Plot a glyph at the specified 3D points. (Supersedes plpoin3
      because many[!] more glyphs are accessible with plstring3.)
      Set up the call to this function similar to what is done for plline3.
      The glyph is specified with a PLplot user string.  Note that the user
      string is not actually limited to one glyph so it is possible (but not
      normally useful) to plot more than one glyph at the specified points
      with this function.  As with plmtex and plptex, the user string
      can contain FCI escapes to determine the font, UTF-8 code to determine
      the glyph or else PLplot escapes for Hershey or unicode text to
      determine the glyph.
    
n
          (PLINT
            Number of points in the xyz
x
          (PLFLT_VECTORA vector containing the x coordinates of the points.
y
          (PLFLT_VECTORA vector containing the y coordinates of the points.
z
          (PLFLT_VECTORA vector containing the z coordinates of the points.
string
          (PLCHAR_VECTOR
            A UTF-8 character string containing the
	    glyph(s) to be plotted at each of the
	    n
      Redacted form: plstring3(x, y, z, string)
    
This function is used in example 18.