0 Initial vs. non-initial shapes: Є/Е, /О, /У, IA/.

1 Ѕ is a numerical sign only.

2 Й is hardly a separate letter of the alphabet; the letters Ю и also accept a brevity sign.

3 In loanwords of Greek origin (or ones adopted through the Greek language), letters И and І correspond to eta and iota, respectively. In the words of Romanian origin and in Slavic loanwords, their usage follows pre-1917 Russian rules, namely, І before vowels, otherwise И.

4 The distinction of and О is present not only in loanwords, but in Romanian words as well.

5 ↑ — this special letter is used for writing the preposition/prefix în, îm (=in). It has no Unicode equivalent. Probably, it is a modified letter (↑ appears in the beginning of words, and can be found only in the middle and at the end; thus, this pair of letters is very similar to the one mentioned in Note 0 above).

6 Letters , , and are used for copying Greek spelling of loanwords (especially for names and toponyms).