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what is a Absolute reference
Zero relative velocity to another object, sure no problem. Zero absolute velocity, not possible as there is no absolute reference to compare to.
There is really no such a thing as "absolute potential energy"; potential energy refers to the difference in energy between two points. For purposes of calculation, a convenient reference point is often chosen, and one such reference point is a point at an infinite distance.
Use absolute references. e.g. $B$12 instead of just B12.
Use absolute references (e.g. $C$3) instead of relative references (e.g. C3). See related questions for more information about absolute references.