The size of the halo shows approximately how precisely your location can be determined: the smaller the halo, the greater the precision. Third-party apps ma...

https://www.apple.com/jp/privacy/docs/Location_Services_White_Paper_Nov_2019.pdf

in Settings or Safari preferences to receive tracking protection. Social widgets embedded on other websites, such as Like buttons, Share buttons, and commen...

https://www.apple.com/jp/safari/docs/Safari_White_Paper_Nov_2019.pdf

or as an agglomerate and where, for 50 percent or more of the particles in the number size distribution, one or more external dimensions are in the size ran...

https://www.apple.com/jp/environment/pdf/Apple_Regulated_Substances_Specification_Sept2018.pdf