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).
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.
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.
Eilat (/eɪˈlɑːt/; Hebrew: אֵילַת [eiˈlat]; Arabic: إيلات, translit. 'aylaat or Arabic: أيلة, translit.