See the collections.abc module. Of the abstract base classes listed there, list in Python implements Iterable, Container, Sized, Sequence and MutableSequence. Now, of these, Iterable, Sequence and MutableSequence could be casually called list-like.
However, I would understand the term list-like to mean that it is a MutableSequence – has at least the methods __getitem__, __setitem__, __delitem__ and __len__, expecting also it to have the mixin methods mentioned in the documentation, such as append.
If there is no need for __setitem__ and __delitem__ it should be called a sequence instead – the assumption is that if something accepts a sequence, it does not need to be mutable, thus str, bytes, tuple etc also work there.
Your two links highlight the vagueness of the term:
The plotly API requires that the list-like objects will be serialized to a JSON array by the internal PlotlyJSONEncoder that delegates most of the encoding to the Python JSONEncoder. However, the latter encodes only tuple and list (and subclasses) to a JSON array; thus the list-like here means a list, a tuple or subclasses thereof. A custom sequence object that is not a subclass of either will result in TypeError: [...] is not JSON serializable.
The unzip recipe you linked to requires an object that behaves like a Sequence, (mutability is not required), thus a tuple or str, or any custom object implementing Sequence will do there.
TL;DR list-like is a vague term. It is preferable to use the terms iterable, sequence and mutable sequence instead, now that these are defined in collections.abc.