I agree with using the dot 4 print symbol indicator with these questions marks. See Formats Section 18.3.3 to start. Precede each question mark with a dot 4 and follow print. If there is no space in print, they should be unspaced in braille. I'm not sure that the TN given there is a good fit for this situation. I prefer your idea of the embedded TN. Take a look at Formats Section 3.2.3 and the sample that follows. You might do something like ??? TNfreestanding question marksTN [braille]@8@8@8 ,'free/&+ "q m>ks,'