Representing a hornedviper. The hieratic Treatise on Ophiology provides a description: ‘Its color is similar to that of the quail; it has two horns on its forehead; the head is broad, the neck narrow, and the tail thick.’ This glyph was conventionally colored yellow. The phonogrammatic value of f is derived by the rebus principle from the word for a viper, ft (Demotic fy).