Er

ER or er may stand for:

Elizabeth Regina (Elizabeth the Queen); see Elizabeth I of England and Elizabeth II of the United Kingdom.
An emergency room in a hospital, wherein victims arrive in emergency situations (usually by ambulance).
- The ER (TV series), a popular NBC medical drama set primarily in an emergency room.
The biblical figure Er, the eldest son of Judah.
The endoplasmic reticulum in cell biology, which can be either rough or smooth.
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.
Er (Р), a letter in the Cyrillic alphabet.
The English sound "er," indicating hesistation, similar to huh and other speech disfluencies.

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