it generally refers to an account on which “hedging” (holding simultaneous long and short open positions on the same instrument) has not been disabled by the broker for legal reasons (these vary from country to country, regulator to regulator and even sometimes according to where the account-holder lives, regardless of the brokerage)
that’s a different use of the word “hedging,” referring typically to the broker’s laying off of their own net liabilities with an independent liquidity provider - this sometimes happens but far more often not, even when the brokerage claims that it does
it’s a hugely controversial issue in this forum
i can’t add to what i said in these posts/threads -