[NTG-context] section head unnumbered but with dots in TOC ?

Hi, I am lost in ConTeXt's setup-jungle: I have a section set is unnumbered: \setuphead[LevelThree] [number=no, ...| But in the TOC I would like to have a dot (or another symbol) before the head/title, like this: o Section's Title 17 Is this a matter of \setuphead or \setuplist? Or none of them? How can it be achieved? Steffen