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Yes. Remember that rectangles and squares are both parallelograms. Square tiles are the most common. The next most common are rectangles. Both shapes can tessellate finite planes. Other parallelograms can tessellate infinite planes (or finite ones if you allow parts of the parallelogram along the edge of the plane.)
There is no finite-length decimal number for pi. The decimal for pi goes on until infinity! The most commonly used approximation is 3.14
Hopefully the same thing it means in most other grades of geometry, which is a straight one dimensional object that is infinitely long. It differs from a ray, which has a finite point and extends infinitely from that point in a single direction, and a line segment, which has two finite ends.
The equality of outcome is the standard of equality that is most concerned with the distribution of resources. Equality of outcome is used regularly in politics.
There is no "last" number that we can quantify. Normally we consider infinity to be the highest number on the number line, but it is not finite and tangible like most other numbers.