A: The "0" is aught which is the term describing the size. See below for a better explanation:
Seed Beads in general, typically including Hex Cut seed beads, are sized somewhat counter-intuitively. They are numbered from 7 through 20, with 7 signifying the largest seed bead available and 20 signifying the very smallest. If you see the term "aught" or "aught-size", this is what is being referenced.
One easy way to remember that a smaller number equals a larger size in the seed bead world, is to think of it like you think of wire gauges. When working with wire, a smaller gauge signifies that your wire will have more thickness and a larger gauge signifies that your wire will have less thickness. This is similar to seed beads in that smaller numbers equal larger size.
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