They want to 'sub'scribe to this thread so he receives email notifications when there are updates. You can subscribe either by posting a comment or clicking the "Watch" button at the top of every page. The / was probably a missed Shift key.
I have been away for a while and have not gone back thru the preceding 53 pages to see if there was a reason for the vigen being dropped off the list or was it a accidental deletion. I rally would like to have a good set if that is possible. thank you doug