Further, for the Position under the Dyanmics 365 , you should check the following articles for more details about the Position entity you found under Dynamics 365, and I don't think it should mean "Salary":
Awesome, thank you for those linke @v-micsh-msft. That does provide a little more context.
As for "Exchange Rate" and "Currency", seeing on how these fields are in Common Data Service, it would seem that they would be provided a little more explanation there (but they are of course not). I apologize, but I could not find any more context around these fields in your provided links. Do you have an exact link that does have more information?
I just got an email ping from your service @v-micsh-msft asking if I have gotten an answer to this question, so I am passing it on to you. 😉 I am still interested in learning more about Currency and Exchange Rate and how they relate to this entity (and others?). Thank you in advance for any assistance.