In EE3, it is not easy, it will require changing a core file (includes/functions/pricing.php) to remove reference to the currency symbol and it will affect more than just the registration page.
Alternatively you could add a filter to replace the currency symbol on the front end of the website. For example if the currency that’s set is the Euro this function could be added to a site specific functionality plugin:
The support post ‘currency sign’ is closed to new replies.
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