
1) Ancient monograms
Found on
https://www.crosswordclues.com/clue/sigla

abbreviations, symbols and signs
Found on
http://phrontistery.info/s.html

• (n. pl.) The signs, abbreviations, letters, or characters standing for words, shorthand, etc., in ancient manuscripts, or on coins, medals, etc.
Found on
http://thinkexist.com/dictionary/meaning/sigla/

(from the article `biblical literature`) ...These tell of divergent readings in Temple scrolls of the Pentateuch, of official `book correctors` in Jerusalem, of textual emendations on the ... ...criticus), preferably at the foot of the page. These notes are usually couched in a special terminology that relies heavily on abbrev...
Found on
http://www.britannica.com/eb/a-z/s/93
Sig'la noun plural [ Latin ] The signs, abbreviations, letters, or characters standing for words, shorthand, etc., in ancient manuscripts, or on coins, medals, etc.
W. Savage. Found on
http://www.encyclo.co.uk/webster/S/100
No exact match found.