It is a treat that is frozen and taken as a polo ("ice cream"). It is very popular in Spain and produced under several different company names. The pioneer seems to be FlagGolosina, and perhaps inspired the others to use a brand similar to "flag", such as Burmar Flax or Kelia Flash. As a curiosity, businessman Evaristo Burgueño Martín used 'Flax' as a tribute to the comic book hero Flash Gordon, but the word 'Flash', as is, was used by the Kelia company, not Burmar.
