A word separator is a text unit whose primary role is to separate words. Unicode SPACE U+0020 and non-breaking space U+00A0 are common examples. In CSS, the word-separator classification helps determine where word spacing is applied after white-space processing.[ref]
Separation and line breaking are related but distinct. In a suitable ordinary text context, a normal space between 10 and kg provides a possible break. Using a non-breaking space there keeps the number and unit together at that boundary. Both characters can still provide visible separation.[ref]
A language can also write words without visible separators, so a count of space characters is not a universal word-counting method. Text shaping, word spacing and permitted breaks must follow the appropriate text-processing rules. A separator's stored character and the selected glyph advance jointly participate in the geometry.

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  1. Word spacing
  2. Typography
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