an axiom is a fact/property such as "ac = ca"
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It is NOT considered a universal truth. It used to be, because mathematicians considered it to be "self-evident", but more recently, mathematical systems both with and without the parallel axiom have been developed. It turns out the "non-euclidian geometries" are very useful. In the real world, the euclidian geometry does NOT apply - although in many cases it is a good approximation.
When you need to measure the distance between two objects (to install a dishwasher, for instance), the ruler postulate is no only helpful, but necessary.
A fjord is a real world example of a fjord! They exist in the real world.
It is an axiom necessary for the real numbers to form a field.
2 is a real world prime number.