ER
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ER or er may stand for:
- Elizabeth Regina (Elizabeth the Queen); see Elizabeth I of England and Elizabeth II of the United Kingdom.
- The biblical figure Er, the eldest son of Judah.
- An emergency room in a hospital, wherein victims arrive in emergency situations (usually by ambulance) or much to the dismay of emergency physicians and nurses, when they have a minor illness but are unable to see a family doctor.
- The endoplasmic reticulum in cell biology, which can be either rough or smooth.
- Equine Exertional Rhabdomyolysis, or Exertional Rhabdomyolysis, a syndrome that causes the degeneration of muscle tissue in a horse. It is more commonly known as tying up or Monday Morning Disease.
- In baseball, an earned run; a run that was scored without the aid of an error by the fielding team.
- An entity-relationship diagram, which is a way of visualizing a database's table layout.
- The ISO country code for Eritrea.
- The chemical symbol for Erbium.
- A word in the Dutch language, with five different meanings.
- A word in the Danish language, meaning is.
- A word in the Norwegian language, meaning is.
- A word in the German language, meaning he.
- Er (Р), a letter in the Cyrillic alphabet.
- The English sound "er," indicating hesitation, similar to huh and other speech disfluencies.