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Then spell it out as "10-meter". Having a clear and understandable headline is better than saving a few characters.

• marginalia_nu 3y ago
  Eh, this is something HN does automatically after submission. It also sometimes drops words.
  • layer8 3y ago
    Submitters can re-edit the title after the fact.
    • hk__2 3y ago
      I saw this comment several hours after submission and it was already too late to edit the title. I copy/pasted the title from the blog, so I guess it’s HN who capitalized that letter.