Auslan; Australian Sign Language ; NZSL; New Zealand Sign Language ; Gebärdenraum; Kongruenz (Gebärdensprache) ; Agreement (sign language) ; Space (sign language) ; Dialektologie (Gebärdensprache) ; Dialectology (sign language) ; Language variation (sign language) ; Register (sociolinguistics) ; Sociodialectology ; Sociolect ; Elderspeak; Gerontolekt; Seniorensprache; Old age (language behavior) ; Sex-specific communication; Genderlect; Sex-specific language behavior; Gender-specific language behavior; Geschlechtsspezifisches Sprachverhalten; Gender-specific communication ; Soziokulturelles Milieu; Sociocultural environment; Socioeconomic status ; Ethnizität und Sprache; Ethnicity and language; Language and ethnicity ; Critical period (language acquisition) ; Alter (Einfluss auf Spracherwerb) ; Age (influence on language acquisition) ; Age of acquisition; AoA; Sensitive period (language acquisition) ; Pronoun syntax ; Subject ; Null subject; pro-drop; Subjectless clause