I sometimes leave notes to myself in the blank spaces of chord charts, but music symbols, such as chord suffix symbols, were not available in Text mode under the old wheel system of iReal b. (At least, I don't know that they were.) But symbols like the triangle, diminished, half-diminished, sharp, flat, are now available in iReal Pro's Text mode, albeit indirectly. You can copy them over from the Chord mode suffix-build window and paste them into the Text mode window. Nice little bonus.