In the transformer, one of the coils is called the primary, called the input of the transformer and the other is the secondary, which is known as the output of the transformer.
A transformer may have more than one coil in the primary and more than one coil in the secondary, depending on its construction, application and design need. If the secondary winding of the transformer has a smaller number of turns than the primary winding, it will be a voltage reducing transformer. ORC1SBNHP14P25
If the secondary winding of the transformer has a greater number of turns than the primary winding, it will be a voltage transformer and in turn, if it presents the same number of turns in the primary and secondary windings, it will be considered a transformer insulator.
The number of turns in the symbol does not suggest the actual size of the winding, but somehow serves to guide which application the transformer is using. Although often the size of the secondary winding design is greater so that it can be inserted in conjunction with the symbols of the other components.