Good morning, I'm looking at some logic diagrams for relays and have encountered something that I've never seen before. I haven't looked on the internet extensively since I thought the folks here at the forums would be able to answer my question more quickly. My experience with logic is limited (I'm more of a Power guy) so I've not looked at much outside of classes on the subject; so if anyone could explain to me what this little thing in the picture below does, I'd be much obliged. http://forum.gon.com/picture.php?albumid=8041&pictureid=44664 Thanks for your help. -Tyler.