The property of real numbers demonstrated in the sequence 3, 5, 6, 3, 5, 6 is known as the Identity Property of Addition.
This property states that when you add a number to zero, the result is the original number. However, in this context, the focus is not solely on the addition of zero but rather on the repetition of the sequence which represents how the identity of the numbers is preserved even when they are repeated. In simpler terms, the numbers remain consistent and recognizable no matter how many times they appear.
In mathematical terms, this can also relate to the property of Closure which states that if you take any two real numbers and add them together (or multiply) the outcome will always be a real number. The display of repetition emphasizes that the set of numbers {3, 5, 6} maintains its identity as real numbers even when viewed multiple times or manipulated.
Moreover, the arrangement and reorder of these numbers accentuate their nature as real numbers, re-emphasizing their original identities further within a larger operational context.