Russian orthography has been reformed officially and unofficially by changing the Russian alphabet and spelling rules over the course of the history of the Russian language. Several important reforms
In early Russian typewriters like this one, there was no key for the digit 1, so the dotted І was used instead. Following the Russian alphabet reform of 1918, a 1 key was added.
A blackboard with handwritten pre-revolutionary Russian
An old typewriter with the 'banned letters' removed
Early Soviet documents frequently mixed pre- and post-Revolution spelling
Yat
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Yat or jat is the thirty-second letter of the old Cyrillic alphabet.
Reforms of Russian orthography
…of Popular Education. Russian orthography was made simpler and easier by unifying several adjectival and pronominal inflections, conflating the letter ѣ with е, ѳ with ф, and і and ѵ with и. Additionally, the archaic mute yer became obsolete, including the ъ (the "hard sign") in final position following…
Pre-revolution typewriter with Yat on the bottom row, between Ч and С.
Cover of 1880 edition of Turgenev's Fathers and Sons, with yat in the title: дѣти is spelled дети.
An antiques shop named with the pseudoarchaic orthography "антиквариатѣ" (current spelling : "антиквариат", pre-reform spelling : "антикваріатъ").
Vĕstnik časopis (14 January 1854) with extensive use of Yat