The human-readable label for the field.
This will be used as the title of Form API elements for the field in entity edit forms, or as the label for the field values in displayed entities.
If not specified, this defaults to the field_name (mostly useful for fields created in tests).
Type: string
protected $label;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldConfigBase.php/property/FieldConfigBase::label/8.1.x