Both standards
Tumble drying allowed
Safe in a tumble dryer.
The square is drying, and the circle inside it is the dryer drum. On its own, with no dots, it permits tumble drying without setting a heat limit.
Where it sits on the label
- Washing
- Bleaching
- Drying
- Ironing
- Professional care
Drying comes third of the five. A label is always written in this order and simply leaves out whatever does not apply, so a tag carrying only three symbols is not missing anything. The next shape along yours is the next of these its maker had something to say about.
The rest of the square