Amusingly there is plenty of precedent (link below under Nasdaq Integrated Platform Suffix and the older ACT/CTCI suffixes) for using all of the wonderful character symbols to indicate different classes of securities.
Not as common, again, as it used to be...but still exists.
Not as common, again, as it used to be...but still exists.
https://www.nasdaqtrader.com/trader.aspx?id=CQSsymbolconvent...