Left hand/right hand editorial annotation

[Thomas Ruedas]

Hi,
I'm looking for a specific symbol whose name I unfortunately don't know 
and didn't find when browsing the documentation, but which I'm sure 
Lilypond has implemented somehow.
In polyphonic piano music, you may sometimes have a situation where e.g. 
two voices are written in the lower staff for the left hand, but some of 
the notes in the upper voice are so much higher than the lower voice 
that they would be very hard or impossible to play with the left hand 
alone, but they may be within the reach of the right hand. So the 
composer or editor may decide to put that symbol next to the first note 
that is to be played by the right hand, and an upside-down version of it 
next to the first note of that part that is to be played by the left 
hand again. The symbols I look for look like the floor and ceiling 
symbols some of you may know from mathematical typesetting to indicate 
the next smaller/greater integer, or like an upside-down L and a regular L.
Is there such a symbol in Lilypond, and how do I use it?
Thomas