Abbreviations and acronyms
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Rule · bucket: judgment · severity: note · detector: none · since: v0.1.0
Section: UI writing
Group: Words

Forbidden:
  "Apt. no.", "The ETA of the dept. manager is COB tomorrow"

Instead:
  "Apartment number". Write it out. Abbreviations save a few characters and cost the reader a moment of decoding every time.

Where one is genuinely necessary, expand it on first use: "ETA (estimated time of arrival)". Best is usually to remove it altogether, even if the sentence gets longer.