05:43 Jul 8 

of the pseudonym אבנ"ס was אגף ביקורת ניהול סיכונים thanks anyway

05:23 Jul 1 

The pseudonym אבנ"ס often appears as Avnas, i.e. הבלוג של Avnas
I found references to Avnas in The Key to Solomon's Key By Lon Milo DuQuette on page 189 in a Google Books edition. I saw references to him in medieval texts as the King of Hades, Demon of Fire, etc.
I also found references in ancient Hebrew texts when I searched for אבנ"ס
See

אבנ.ס. ני. האותיות. שנקראים,. תבה. הם. הראשונים. בעולם. ' שטהם. גרא. ב"ה. את. הע:לם. 1. וע"נ. שס. העצם. תבה. *. וטלת. דיבור. נולל. פירושיס ...
www.hebrewbooks.org/pagefeed/hebrewbooks_org_6863_34.pdf
1. Midrash shoḥer ṭov hu midrash Tehilim: ʻim ... beʾur ha-Ram - Google Books Result
by Aaron Moses Padua, Mordekhai Gimpel Yafeh - 1865 - 396 pages
... מרי ל״י ו *י[ אבנ ס עמה ־ , יע י כ י ...
books.google.com/books?id=JycQAAAAYAAJ... -
Unfortunately I can’t make sense of these texts, but one of them led to something about Cohen.
I hope this helps.