This character is a Other Letter and is mainly used in the Hangul script.
The glyph is a canonical composition of the glyphs Glyph for U+1100Hangul Choseong Kiyeok, Glyph for U+116EHangul Jungseong U. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+AD6C forms a Korean syllable block with similar characters, which prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
A gu, or district, is an administrative unit in South Korea. There are two kinds of districts in South Korea. One is the autonomous district of special and metropolitan cities, which is a municipal entity similar to a city with its own mayor along with its own legislative council. The other is the non-autonomous district of municipal cities. Cities with over 500,000 people are allowed to have gu (notable exceptions to this rule are the cities of Gimhae, Hwaseong, and Namyangju).