con-offer uncon-offer what does it mean?

Con offer means securities.

A marketable security is a certificate with a par value that is used to prove that the holder or a specific entity designated by the security has ownership or claims on specific property.

Marketable securities are a form of fictitious capital. They have no value in themselves, but they have a price.

Securities can be divided into three categories according to the different nature of the property rights they represent: commodity securities, currency securities and capital securities.