I frequently see "hmmm" proceeding a comment on SE. Is there a standard to interpret this? Does it simply mean that one disagrees but still considers the answer, question, or comment? Or is it just as vague as in spoken language? In spoken language though there are more means to find out the reason for the use.
As a matter of fact, I already heared it mentioned rwo times on TV. In a quizshow about the smartest person in Holland. Smartest in the sense who knows most facts.
I suggested a solution about how to flip the magnetic field of the Earth. By means of a huge external field generated in space. The first reaction in a comment was "Hmmm,...". The solution was taken seriously though. There were extra questions asked.
More generally, is it a noun, an adjective, a verb, or is it all in one. I read in an answer below it's a quasi word. Do the qualifications or classes apply to quasi words?