ʹ

See also: ′ [U+2032 PRIME], ´ [U+00B4 ACUTE ACCENT], ˊ [U+0301 COMBINING ACUTE ACCENT], ◌́, and ʺ [U+02BA MODIFIER LETTER DOUBLE PRIME]

ʹ	U+02B9, ʹ MODIFIER LETTER PRIME

Character variations

ʹ	U+0374, ʹ GREEK NUMERAL SIGN

Translingual

ʹ

A mark used for transliteration of Cyrillic Ь.
(lexicography) A mark for palatalization in Cyrillic dictionaries, equivalent to IPA ⟨ʲ⟩ or Americanist ⟨ʸ⟩.
Synonym: ꚝ

ʹ

See also: ͵ [U+0375 GREEK LOWER NUMERAL SIGN]

English Wikipedia has an article on:

Greek numerals

Wikipedia

ʹ

Used to form Greek numerals from the letters of the Greek alphabet. In modern texts, the use of these Greek numerals rather than Hindu–Arabic numerals is equivalent to the use of Roman numerals in Latin script.

Units	1	2	3	4	5	6			7	8	9
1s	Α΄ α΄	Β΄ β΄	Γ΄ γ΄	Δ΄ δ΄	Ε΄ ε΄	Ϛ΄ ϛ΄	ΣΤ΄ Στ΄ στ΄	Ϝ΄ ϝ΄	Ζ΄ ζ΄	Η΄ η΄	Θ΄ θ΄
10s	Ι΄ ι΄	Κ΄ κ΄	Λ΄ λ΄	Μ΄ μ΄	Ν΄ ν΄	Ξ΄ ξ΄			Ο΄ ο΄	Π΄ π΄	Ϟ΄ ϟ΄
100s	Ρ΄ ρ΄	Σ΄ σ΄	Τ΄ τ΄	Υ΄ υ΄	Φ΄ φ΄	Χ΄ χ΄			Ψ΄ ψ΄	Ω΄ ω΄	Ϡ΄ ϡ΄
1000s	͵Α ͵α	͵Β ͵β	͵Γ ͵γ	͵Δ ͵δ	͵Ε ͵ε	͵Ϛ ͵ϛ	͵ΣΤ ͵Στ ͵στ	͵Ϝ ͵ϝ	͵Ζ ͵ζ	͵Η ͵η	͵Θ ͵θ
10,000s	͵Ι ͵ι	͵Κ ͵κ	͵Λ ͵λ	͵Μ ͵μ	͵Ν ͵ν	͵Ξ ͵ξ			͵Ο ͵ο	͵Π ͵π	͵Ϟ ͵ϟ
100,000s	͵Ρ ͵ρ	͵Σ ͵σ	͵Τ ͵τ	͵Υ ͵υ	͵Φ ͵φ	͵Χ ͵χ			͵Ψ ͵ψ	͵Ω ͵ω	͵Ϡ ͵ϡ
Greek number and measurement appendix

The Unicode code point U+0374 GREEK NUMERAL SIGN is canonically equivalent to U+02B9 MODIFIER LETTER PRIME.

ʹ

The twenty-ninth letter of the Ludian alphabet, called pehmed pilkeh and written in the Latin script.

ʹ

Suprasegmental palatalization is marked by a free-standing prime or acute accent (´) added after the vowel.

ʹ

The twenty-ninth letter of the Veps alphabet, called pehmenduzznam and written in the Latin script.

Considered its own letter, like in Ludian.
Only found after consonant letters.
In many digital sources, this symbol is (by Unicode standards incorrectly) encoded as an apostrophe (' (U+0027 APOSTROPHE) or ’ (U+2019 RIGHT SINGLE QUOTATION MARK)).