Dinarim means coins (Dinar - coin, Dinarim - coins). This is an element in the platform that the user earns and then these 'dinarim' can be used to unlock "Real World Impacts" (see here about RWI's).

The way to earn dinarim is by "unlocking" the chest that is on your dashboard every 24 hours. Every 24 hours you can receive a half dinar. You also have the option of purchasing dinarim to donate towards a mitzva in the RWI store. See also this article on why every 24 hours.