Offered for your consideration: Antique pin by C. G. Braxmar Co Ney York, 14k Gold With sigma symbol and with an owl with a small chain connecting two. Sigma is a mathematical symbol, owl as far as I know is some cultures references wisdom. I am not sure why exactly it was made, what was the purpose, but... could be to honor mathematical achievements. I have a lot of photos of it showing from all different angles. Overall very interesting piece in my opinion. I will gladly respond to any questions you may have.