All vectors that are perpendicular (their dot product is zero) are orthogonal vectors.
Orthonormal vectors are orthogonal unit vectors. Vectors are only orthonormal if they are both perpendicular have have a length of 1.
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The answer will depend on orthogonal to WHAT!
What are difference between scalars and vectors
In a plane, each vector has only one orthogonal vector (well, two, if you count the negative of one of them). Are you sure you don't mean the normal vector which is orthogonal but outside the plane (in fact, orthogonal to the plane itself)?
Given one vector a, any vector that satisfies a.b=0 is orthogonal to it. That is a set of vectors defining a plane orthogonal to the original vector.The set of vectors defines a plane to which the original vector a is the 'normal'.
The zero vector is not perpendicular to all vectors, but it is orthogonal to all vectors.