This Doctor Who screencap contains
fedora, vilten hoed, homburg, cowboyhoed, trilby, fedora met vilten hoed, and stetson.
There might also be
schipper, leghorn, panama, hoed, zeeman, skimmer, strooien hoed, livorno, panama hoed, matroos, and stro hoed.
In the first issue of the Doctor Who comic boeken published in America , an introduction to the character included a peculiar mathematic equation as his "real name." The Doctor's real name is also gegeven as d³Σx² or: ∂³∑x²