[Alan Anderson]

The feedback node is found in the Structures palette. It points from right to left by default. The diamond underneath it is how older versions of LabVIEW marked the initializer terminal; this year it looks like an asterisk which becomes a cursive i when wired.

The green T/F is a Boolean constant from an older version of LabVIEW. It would alternately highlight the T and the F when clicked on. LabVIEW 2012 instead displays it as a single square with either a T or an F in it. You'll find the T and F constants in the Boolean function palette.