І

Rules for usage in Russian (pre-1918)

• ⟨і⟩ was used before all vowels and before the semivowel ⟨й⟩ except at the end of a morpheme in a compound word, where ⟨и⟩ was used. So англійскій (English) used ⟨і⟩, but пяти + акровый = пятиакровый (five-acre) used ⟨и⟩.
• ⟨и⟩ was used as the last letter of a word and before consonants except in міръ for "world, universe, local community, commons, society, laity" (and words derived from it) to differentiate from миръ ("peace"). Since 1918, both are spelled мир.
• In a few words derived from Greek, use was derived etymologically based upon whether iota or eta was in the original Greek: Іисусъ "Jesus", from Greek Ιησούς, now written Иисус; also Іванъ from Ἰωάννης, now written Иван. However, since the middle of the 18th century loanwords came to be spelled according to the general rule: Іоаннъ but Иванъ, Никита (instead of Нікита), Филиппъ (instead of Філіппъ).