It's a common sign of irritation or frustration in comics.
The majority of squiggles I see are like a small ball or wad of string. The ones that have more of an axial shape are usually just one stretched spiral; this one is like a full blown twister! :-D I wonder if the shapes somehow denote the level of frustration.
The majority of squiggles I see are like a small ball or wad of string. The ones that have more of an axial shape are usually just one stretched spiral; this one is like a full blown twister! :-D I wonder if the shapes somehow denote the level of frustration.
No. It's just different ways of drawing the same thing. It's down to artist preference.