charIDToTypeID( "xxx" ) Reference

I am using scriptlistener to record some scripts.  It is of course filled with this stuff

var id41 = charIDToTypeID( "Vrtc" );

var id42 = charIDToTypeID( "#Rlt" );

I can figure some of it out. But I some I can't. In this case I am not sure what" #Rlt" means or if there are perhaps any other options that migh be used there.

Is there a reference somewhere to all of these codes?  Or is this just magic?

TIA