U+3099 "゙" Combining Katakana-Hiragana Voiced Sound Mark Unicode Character

U+3099 "゙" Combining Katakana-Hiragana Voiced Sound Mark is a diacritical mark used in the Japanese writing system to indicate that a preceding kana character, whether hiragana or katakana, should be pronounced with a voiced sound, such as turning "ka" into "ga" or "sa" into "za". Unlike the standalone voiced sound mark (dakuten), which is typically written as two small strokes, this combining version is designed to be applied directly above or adjacent to a base character through character encoding, allowing for more precise digital text representation and rendering. It is part of the Unicode standard's combining diacritical marks block and is essential for accurately displaying Japanese text in digital formats where proper phonemic voicing must be indicated.