Is there a Māori or Te Reo sign language?
There are signs in NZSL that express Māori cultural experience and referents, and this vocabulary is expanding as Maori Deaf people gain more access to Māori contexts through the use of NZSL. So, while some people refer to these concepts as “Māori signs”, there is no distinct “Māori Sign Language”. Spoken Te Reo Māori can be interpreted into NZSL (Te Reo Turi), and vice-versa – translating from the sense and structure of one language into the sense and structure of the other.
Source: NZSL Online Dictionary
Is Sign Language universal?
There is no universal sign language. Different sign languages are used in different countries or regions. For example, British Sign Language (BSL) is a different language from ASL, and Americans who know ASL may not understand BSL.