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 television 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.