But according to the 32 marks, it is "head like a royal turban." So that could mean the top-knot of hair on his head? If we take the literal view that it is a cranial protrusion and not a metaphor, then we would also have to accept that:
He can touch his knees with the palms of his hands without bending. (#9; Pali: thitako va anonamanto)
He has an immense torso, like that of a lion (#17; Pali: sihapuba dhakayo).
He has a large, long tongue, that can reach the forehead and the ears (#27; Pali: pahutajivho).
I prefer the metaphorical, symbolic account, not the literal, though I expect you knew that already.