In the context of OKLCH (a modern color space), numbers like 100, 200, ..., 900 typically refer to color scales or steps in a color palette, not something intrinsic to OKLCH itself.

Here's how it breaks down:

• OKLCH stands for OK (Oklab) Lightness, Chroma, Hue.
• It's a perceptually uniform color space — meaning changes in values correspond to consistent visual changes in color.
• The numbers 100, 200, ..., 900 are just naming conventions, most commonly used in design systems or utility-first CSS frameworks (like Tailwind CSS or design tokens) to define shades of a color.

For example:

You might define a blue scale in OKLCH like this:

--blue-100: oklch(95% 0.02 240);
--blue-200: oklch(90% 0.04 240);
--blue-300: oklch(85% 0.06 240);
--blue-400: oklch(75% 0.08 240);
--blue-500: oklch(65% 0.10 240);
--blue-600: oklch(55% 0.10 240);
--blue-700: oklch(45% 0.10 240);
--blue-800: oklch(35% 0.08 240);
--blue-900: oklch(25% 0.06 240);

What’s going on here:

• The lightness (L) is being adjusted from 95% (very light) to 25% (very dark).
• Chroma (C) might vary a bit depending on desired vibrancy.
• Hue (H) stays constant for a given base color.

So the 100–900 scale:

• Is a semantic scale (e.g., 100 = lightest tint, 900 = darkest shade).
• Is inspired by systems like Material Design or Tailwind.
• Helps developers and designers manage consistent color palettes.

Let me know if you want to generate your own OKLCH palette or need help converting colors!