This will tell you about the fabric content of your clothes and how it should be washed.
Symbol
Wash / Fabric type
Normal Wash
Cotton, Mixed Fabrics
Easy Care
Synthetic, Mixed Fabrics
Special Delicate Wash
Delicates
Hand Wash Only
Wool, Silk
Do not wash
The dashes under the symbol give you information about the type of fabric and the maximum allowance of mechanical stress.