What are the differentiations between symbols ending in "m," "v," and "mv"?

The difference between the currency pairs that end in an “m” letter and those that do not, is their type of execution. The currency pairs with “m” ending are market execution type, and the other pairs are instant execution. Read more about the market and instant execution.

Also, there are currency pairs that end in “v” or “mv” letters, which show the account and execution types. The “v” letter stands for VIP account type, and the “mv” indicates market execution type in VIP account.