'Return the symbol of this spot.
If the spot has no explicit symbol set, then return the ScatterPlotItem\'s default symbol instead.'

def symbol(self):

    symbol = self._data['symbol']
    if (symbol is None):
        symbol = self._plot.opts['symbol']
    try:
        n = int(symbol)
        symbol = list(Symbols.keys())[(n % len(Symbols))]
    except:
        pass
    return symbol
