(By Johannes Helmbrecht): "Map 45A is concerned with politeness distinctions in personal pronouns, and more specifically second person pronouns. This phenomenon has been particularly well-studied in European languages. In German, for instance, there is a threefold distinction between a second person singular du 'you.sg.familiar', a second plural ihr 'you.pl.familiar', and a second person polite Sie 'you.honorific', which does not distinguish number. The polite pronoun Sie is the default form of address among German adults who are not in a close social relation to each other. If they are relatives, married, close friends, professional colleagues, or university students, they are very likely to use the familiar du to address each other. The usage of du and Sie is symmetrical (the one who gives Sie (or du) will also receive it), with one exception: Adults address children and adolescents with du, but receive Sie."