This would be just a single node, since no edges (you can think of degree as the number of edges connected to a node). If you are talking about the in-degree, or out-degree of a node being zero, this can happen many times in a directed graph (in-degree = # edges going IN to node, out-degree = # edges going out...).
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A straight line
0 Fahrenheit is colder.
A 54 degree angle is an acute angle because it is greater than 0 but less than 90 degrees
It is an acute angle because it is greater than 0 but less than 90 degrees.
a constant polynomial has a degree zero (0).