TIL that on pre-colonial Easter Island there existed an undeciphered system of writing or proto-writing, called Rongorongo, which would be one of few independent inventions of writing.
TIL that on pre-colonial Easter Island there existed an undeciphered system of writing or proto-writing, called Rongorongo, which would be one of few independent inventions of writing.

en.wikipedia.org
Rongorongo - Wikipedia

What does independent mean here? Not influenced by a previous writing system? Does this imply that all other writing systems have a singular source?
It implies that most of the written languages we're aware of have been based on preexisting character sets, with very few root character sets. This is one of those few root sets.
Amazing! Do you happen to know where the root sets arose from?