Add Currency ISO before price on home & product pages

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I am trying to figure out how to add the currently selected currency (from an app add-in) as the ISO before the price on the home and product pages. I believe this is the code 

{{ currency.iso_code }}

But I am unsure if this is meant to be added through the currency admin to the below code:

<span class=money>${{amount}}</span>

Or, if it should be added to the product-template.liquid file:

{%- if product.compare_at_price_max > product.price -%}

If you could advise on which area is best and include a snippet of the ISO code and how it should be written into either of the above it would be helpful, thanks.