This character is a Other Letter and is mainly used in the Hiragana script.
The glyph is a canonical composition of the glyphs Hiragana Letter Ku, Combining Katakana-Hiragana Voiced Sound Mark. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+3050 offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
く, in hiragana or ク in katakana, is one of the Japanese kana, which each represent one mora. Both represent [kɯ] and their shapes come from the kanji 久.
This kana may have a dakuten added, transforming it into ぐ in hiragana, グ in katakana and gu in Hepburn romanization. The dakuten's addition also changes the sound of the syllable represented, to [ɡɯ] in initial positions and varying between [ŋɯ] and [ɣɯ] in the middle of words.
A handakuten (゜) does not occur with ku in normal Japanese text, but it may be used by linguists to indicate a nasal pronunciation [ŋɯ].
In the Ainu language, the katakana ク can be written as small ㇰ, representing a final k sound as in アイヌイタㇰ Ainu itak (Ainu language). This was developed along with other extended katakana to represent sounds in Ainu that are not found in standard Japanese katakana.