In 1966 17 bankers have united in Interbank Card Association (ICA) which symbol became Latin "i".
In 1969 bank have renamed in Master Charge, and in a logo there were two crossed circles. Symbolical "i" have placed in the bottom right corner.
In 1979 Master Charge have renamed in MasterCard, and the letter "i" has disappeared from a logo absolutely.
In 1990 there were horizontal strips, as a symbol of interbank mutual relations.