There are many kinds of “letters”, credentials, designations around the world. Some mainly apply in-house at a bank or other organization. Some are specific to one country or region. Some are recognized internationally. I have a list with dozens of such designations so if you cannot find it on google you can contact me for further information. The essence is to know that an advisor’s designations fit the work you want them to do, and they demonstrate the advisor’s prolonged in-depth study and recognized practice to serve you with professional care.