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yes
No, it is not.
In Euclidian geometry it's a point. In non-Euclidean geometry all bets are off.
There are 34650 distinct orders.There are 34650 distinct orders.There are 34650 distinct orders.There are 34650 distinct orders.
This depends on how you define ray. If two rays means two distinct lines radiating from a single point, then they can't be parallel in Euclidean geometry.