Make Sense of Seed Bead Sizes

Are all size 11 beads the same? What does the /0 mean and what is an aught? Make sense of round and cylinder seed bead sizes used in beadwork.

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BALABEAD 2mm Size Almost Uniform Glass Seed Beads About 21600pcs Opaque Colors 12/0 Small Craft Beads 2mm Round Glass Seed Beads for Jewelry

Seed Bead Sizes - Buyers Guide to Size & Types

FGB #56 Round Seed Beads 12/0 Silver Lined Gray, About, 54% OFF

I am not crazy! Bead sizes don't make sense : r/Beading

Inspirational Beading: Seed Bead Brand Comparison

Seed bead - Wikipedia

Easy Ways to Calculate Bead Sizes

Clip Art Set of Round Seed Beads Preciosa Seed Bead Sizes Instant

Miyuki vs Toho seed beads ・ClearlyHelena