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You might be thinking of the word origin.
Zero relative velocity to another object, sure no problem. Zero absolute velocity, not possible as there is no absolute reference to compare to.
A Benchmark Fraction.If Zero is the description of nothing then it would be a useful reference point as everything else can be clearly defined
For temperatures, zero is an arbitrary reference point, depending on which scale is used. For Celsius, zero is assigned the the temperature at which water freezes. So temperatures which are colder than this temperature will be negative values, and temperatures warmer will be positive values. Fahrenheit uses a different reference point for zero, but similar principles apply.
An arbitrary zero is a reference point chosen in a scale or measurement system that does not have a natural or fixed value, allowing for flexibility in defining the starting point of a measurement. For example, in temperature scales like Celsius or Fahrenheit, zero is defined arbitrarily based on the specific properties of water and other reference points, rather than being an absolute zero. This concept is important in various fields, including mathematics and physics, where it helps establish relative comparisons and scales.