Prime variable assignation in ppl

[Robin Karpeta]

HI, I apologise if this is a really silly question, but in the Rollmany example program in the user guide (page 454) there appears to be assignment carried out by a triangle symbol (pointing to the right).

I have not been able to enter this into the Prime. Does anyone know how to do this?
The line below is one of the Rollmany program lines in question:

L2(roll)+1L2(roll);

Many thanks for any help.