The flag_meanings CF attribute.
Examples
>>> f.flag_meanings = 'low medium high'
>>> f.flag_meanings
array(['low', 'medium', 'high'],
dtype='|S6')
>>> f.flag_meanings = ['left', 'right']
>>> f.flag_meanings
array(['left', 'right'],
dtype='|S5')
>>> f.flag_meanings = 'ok'
>>> f.flag_meanings
array(['ok'],
dtype='|S2')
>>> f.flag_meanings = numpy.array(['a', 'b'])
>>> f.flag_meanings
array(['a', 'b'],
dtype='|S1')