Can be tumble dried.

Can be tumble dried on a low heat setting.

Can be tumble dried on a high heat setting.

Do not tumble dry.
The drying symbol is a square with various other symbols inside. The most widely used of these refers to tumble drying which is a circle inside the square.
When suitable for tumble drying the symbol may also contain a number of dots indicating the recommended temperature for drying.

Drip drying is recommended.

Hang dry.

Dry flat.