U+02BA MODIFIER LETTER DOUBLE PRIME

U+02BA was added to Unicode in version 1.1 (1993). It belongs to the block Spacing Modifier Letters in the Basic Multilingual Plane.

This character is a Modifier Letter and is commonly used, that is, in no specific script.

The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. The glyph can, under circumstances, be confused with 1 other glyphs. In text U+02BA behaves as Alphabetic regarding line breaks. It has type OLetter for sentence and ALetter for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

A yer is one of two letters in Cyrillic alphabets, namely ъ (ѥръ, jerŭ) and ь (ѥрь, jerĭ). The Glagolitic alphabet used as their respective counterparts the letters and . They originally represented phonemically the "ultra-short" vowels in Slavic languages (including Old Church Slavonic), collectively known as the yers. In all Slavic languages they either evolved into various "full" vowels or disappeared, in some cases leaving palatalization of adjacent consonants. At present, the only Slavic language that uses "ъ" as a vowel sign (pronounced /ɤ/) is Bulgarian (although in many cases it corresponds to earlier "ѫ", originally pronounced /ǫ/). Many languages using the Cyrillic alphabet have kept one or more of the yers to serve specific orthographic functions.

The back yer (Ъ, ъ, italics Ъ, ъ) of the Cyrillic script, also spelled jer or er, is known as the hard sign in the modern Russian and Rusyn alphabets and as er golyam (ер голям, "big er") in the Bulgarian alphabet. Pre-reform Russian orthography and texts in Old Russian and in Old Church Slavonic called the letter "back yer". Originally this yer denoted an ultra-short or reduced middle rounded vowel.

Its companion, the front yer (Ь, ь, italics Ь, ь), now known as the soft sign in Russian, Belarusian and Ukrainian, and as er malək (ер малък, "small er") in Bulgarian, originally also represented a reduced vowel, more frontal than the ъ. Today it marks the palatalization of consonants in all of the Slavic languages written in the Cyrillic script, except in Serbian and Macedonian, which do not use it at all, although its traces remain in the forms of the palatalized letters њ and љ.