ER

This is a disambiguation page; if one followed a link here, one might want to adjust that link.

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ER is an acronymm which refers to:

• In cell biology, the endoplasmic reticulum, which is either rough or smooth
• an acronym for the "emergency room" in a hospital, wherein victims arrive in emergency situations (usually by ambulance).
• ER is a popular NBC medical drama, referring to the above acronym
• Eritrea (ISO country code)
• Elizabeth Regina (Elizabeth the Queen); see Elizabeth I of England and Elizabeth II of the United Kingdom.