Official comment
You do have several options for the way the currency symbol is shown in Administration > Data > Localization:

Comment actions
Posted on behalf of L. Lsachsen:
This is a request to have the currency show on order forms. For example, in the order summary, it would show "USD" next to the price.
You do have several options for the way the currency symbol is shown in Administration > Data > Localization:

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