Yo (Cyrillic) in the context of ALA–LC

Flerovium is a synthetic chemical element; it has symbol Fl and atomic number 114. It is an extremely radioactive, superheavy element, named after the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered in 1999. The lab's name, in turn, honours Russian physicist Georgy Flyorov (Флёров in Cyrillic, hence the transliteration of "yo" to "e"). IUPAC adopted the name on 30 May 2012. The name and symbol had previously been proposed for element 102 (nobelium) but were not accepted by IUPAC at that time.

It is a transactinide in the p-block of the periodic table. It is in period 7 and is the heaviest known member of the carbon group. Initial chemical studies in 2007–2008 indicated that flerovium was unexpectedly volatile for a group 14 element. More recent results show that flerovium's reaction with gold is similar to that of copernicium, showing it is very volatile and may even be gaseous at standard temperature and pressure. Nonetheless, it also seems to show some metallic properties, consistent with it being the heavier homologue of lead.

He is the fifth letter of the Semitic abjads, including Phoenician hē 𐤄, Hebrew hē ה‎, Aramaic hē 𐡄, Syriac hē ܗ, and Arabic hāʾ ه‎. It is also related to the Ancient North Arabian 𐪀‎‎‎, South Arabian 𐩠, and Ge'ez ሀ. Its sound value is the voiceless glottal fricative ([h]).

The proto-Canaanite letter gave rise to the Greek Epsilon Ε ε, Etruscan 𐌄, Latin E, Ë and Ɛ, and Cyrillic Е, Ё, Є, Э, and Ҩ. He, like all Phoenician letters, represented a consonant, but the Latin, Greek and Cyrillic equivalents have all come to represent vowel sounds.

Epsilon (/ˈɛpsɪlɒn/ , uppercase Ε, lowercase ε or ϵ; Greek: έψιλον) is the fifth letter of the Greek alphabet, corresponding phonetically to a mid front unrounded vowel IPA: [e̞] or IPA: [ɛ̝]. In the system of Greek numerals it also has the value five. It was derived from the Phoenician letter He . Letters that arose from epsilon include the Roman E, Ë and Ɛ, and Cyrillic Е, È, Ё, Є and Э. The name of the letter was originally εἶ (eî [êː]), but it was later changed to ἒ ψιλόν (è psilón 'simple e') in the Middle Ages to distinguish the letter from the digraph ⟨αι⟩, a former diphthong that had come to be pronounced [e], and because the digraph ⟨ει⟩ had become unsuitable due to its own shift to [i]. In Modern Greek, its name has fused into έψιλον (épsilon).

The uppercase form of epsilon is identical to Latin ⟨E⟩ but has its own code point in Unicode: U+0395 Ε GREEK CAPITAL LETTER EPSILON. The lowercase version has two typographical variants, both inherited from medieval Greek handwriting. One, the most common in modern typography and inherited from medieval minuscule, looks like a reversed number "3" and is encoded U+03B5 ε GREEK SMALL LETTER EPSILON. The other, also known as lunate or uncial epsilon and inherited from earlier uncial writing, looks like a semicircle crossed by a horizontal bar: it is encoded U+03F5 ϵ GREEK LUNATE EPSILON SYMBOL. While in normal typography these are just alternative font variants, they may have different meanings as mathematical symbols: computer systems therefore offer distinct encodings for them. In TeX, \epsilon ( ${\displaystyle \epsilon \!}$ ) denotes the lunate form, while \varepsilon ( ${\displaystyle \varepsilon }$ ) denotes the epsilon number. Unicode versions 2.0.0 and onwards use ɛ as the lowercase Greek epsilon letter, but in version 1.0.0, ϵ was used. The lunate or uncial epsilon provided inspiration for the euro sign, €.