Meaning
A solid green circle, part of the coloured circle set from emoji version 12.0. It means green and usually signals go, okay, safe or online.
People use it as an available or online status, a done marker in checklists and a positive point in reviews: “Shop update: 🟢 open today until 9 pm” It also suits eco and plant themes. Pair it with 🔴 to contrast yes and no, or good and bad.