# Geometry and Grid Constants

*API Collection*

## Topics

### Points

- [`GSPointNull`](/Core/GlyphsCore/GSPointNull) — Extension in the spirit of `CGRectNull`.

### Grid Rounding

- [`MinPrecisionThreshold`](/Core/GlyphsCore/MinPrecisionThreshold) — The tolerance used when comparing coordinates.
- [`MinMeaningfulGrid`](/Core/GlyphsCore/MinMeaningfulGrid) — The threshold a grid interval must exceed to enable coordinate rounding.

### TrueType Conversion

- [`twoThirds`](/Core/GlyphsCore/twoThirds)

## See Also

### Constants

- [Shape and Path Keys](/Core/GlyphsCore/Shape-and-Path-Keys)
- [Miscellaneous Constants](/Core/GlyphsCore/Miscellaneous-Constants)
- [Legacy Constants](/Core/GlyphsCore/Legacy-Constants)