Image here: http://imgur.com/gallery/AmRkcmB
I am working on a 17th century Latin manuscript and was having trouble figuring out what 2 things mean. First, what does the symbol mean between D. Yvon, ___ D. Dulignon suae? Second, what might the A2 mean on the bottom of this page? The pattern seems to be every other page, but they discontinue after 4. A sample of the pattern is as follows: A2 - p. 3 A3 - p. 5 A4 - p. 7 B - p. 17 (where chapter 2 begins) B2 - p. 19 etc.....
Finally, what does this other symbol mean? http://imgur.com/gallery/AVAugon
Please let me know if a different sub would be better for these questions. Thank you for any help!!!
Both symbols mean and. They're stylised forms of the Latin et which means and. This incidentally is where the ampersand originates. Note the use of the Oxford comma!
The lettering at the bottom is called a "signature mark". It's to assist with the process of book binding. More information can be found here: http://collation.folger.edu/2012/08/deciphering-signature-marks/
There could number a number of reasons why the ampersand is different: it might simply be down to a different person printing the pages; a printing block wore out and was replaced with a different one; the page was printed on different days and they didn't worry about continuity. However, looking at the typeface on both images I'd say they're from two different manuscripts or printers.
Contextually it makes sense if both symbols mean 'and', but I do not understand why it would not consistently use '&' as the manuscript does the vast majority of the time.