# Half-diagonal

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The **half-diagonal** (abbreviated as **hd**) is a natural measurement of distance between parallel glider lanes, or in self-constructing circuitry, e.g. between elbow locations in a universal construction arm elbow operation library.

If two gliders are in the same phase and exactly lined up vertically or horizontally, *N* cells away from each other, then the two glider lanes are considered to be *N* half diagonals (hd) apart. Gliders that are an integer number of full diagonals apart must be the same color, whereas integer half diagonals allow for both glider colors.

## Also see

## External links

- Half-diagonal at the Life Lexicon

- hd at the Life Lexicon