What does T T mean?

T.T is supposed to resemble a face.the tops of the t's are closed eys and the lines are streams of tears. the period is the nose. T.T

I think its something totally different, whereas many people see it as a crying person (As he/she said the 'I' are streams of tears) I think it is a emote without emotion, where the - above the I represent eyebrows and The 'I' represents Eyes.
As in:
Person A: *told aJoke*
Person B: T.T, that really isn't funny...