EI or Ei may refer to:
The Eiffel Tower (/ˈaɪfəl ˈtaʊər/ EYE-fəl TOWR; French: tour Eiffel, pronounced: [tuʁ‿ɛfɛl] listen) is a wrought iron lattice tower on the Champ de Mars in Paris, France.
In linear algebra, an eigenvector or characteristic vector of a linear transformation is a non-zero vector whose direction does not change when that linear transformation is applied to it.
Eid al-Fitr (Arabic: عيد الفطر ʻĪd al-Fiṭr, IPA: [ʕiːd al fitˤr], "festival of breaking of the fast") is an important religious holiday celebrated by Muslims worldwide that marks the end of Ramadan, the Islamic holy month of fasting (sawm).
Einsatzgruppen (German: [ˈʔaɪnzatsˌɡʁʊpn̩], "task forces" "deployment groups") were Schutzstaffel (SS) paramilitary death squads of Nazi Germany that were responsible for mass killings, primarily by shooting, during World War II (1939–45).
The Eiger is a 3,970-metre (13,020 ft) mountain of the Bernese Alps, overlooking Grindelwald and Lauterbrunnen in the Bernese Oberland of Switzerland, just north of the main watershed and border with Valais.
Eilat (/eɪˈlɑːt/; Hebrew: אֵילַת [eiˈlat]; Arabic: إيلات, translit. 'aylaat or Arabic: أيلة, translit.
Eiza González Reyna (Spanish pronunciation: ['ei̯sa ɣon̥'sales 'r̄ei̯na]; born 30 January 1990 in Caborca, Sonora, Mexico) is a Mexican actress and singer.
Eid al-Adha (Arabic: عيد الأضحى, translit. ʿīd al-aḍḥā, lit. 'Festival of the Sacrifice', [ʕiːd ælˈʔɑdˤħæː]), also called the "Sacrifice Feast", is the second of two Muslim holidays celebrated worldwide each year, and considered the holier of the two.
The Einstein field equations (EFE; also known as "Einstein's equations") is the set of 10 equations in Albert Einstein's general theory of relativity that describes the fundamental interaction of gravitation as a result of spacetime being curved by mass and energy.