What do the symbols on the head of Japanese cartoon animation mean?

While watching some Japanese cartoons on TV, I always noticed that some symbols appear on the head of the characters. Sometimes a sweat drop appears when they are aggravated or embarrassed. Sometimes I have seen what looks like crosses, periods and other symbols and shapes. Since I am not familiar with Japanese culture, can someone explain me what these symbols mean? Thank you.

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Kiteman5 years ago
I think the cross-ish symbols are supposed to be throbbing veins.

The water-drop is nervousness or unpleasant shock.
lemonie Kiteman5 years ago
What do you read in this sweat?

blkhawk (author)  lemonie5 years ago
caitlinsdad5 years ago
blkhawk (author)  caitlinsdad5 years ago
Thank you. It answers my question.