The term "911 utau" functions as a proper noun. It specifically names a controversial, fan-made voicebank and its associated character created for the Japanese freeware singing synthesizer application, UTAU. The name combines the subject matter, the September 11, 2001 terrorist attacks ("911"), with the software platform used for its creation ("UTAU").
This particular voicebank, also known by the character name "Aki" or "Akihabara," was developed as an example of moe anthropomorphism, a phenomenon in which non-human objects or concepts are personified as anime-style characters. In this case, the twin towers of the World Trade Center were reimagined as a character for the UTAU software. The project is an instance of user-generated content exploring highly sensitive and tragic historical events, often through the lens of dark humor or shock value prevalent in certain internet subcultures.
Understanding the term as a proper noun is essential for analysis. It isolates the subject as a singular, specific digital artifact and cultural phenomenon rather than a general category or descriptive adjective. This classification allows for a focused discussion on its creation, the intentions of its creator, and the subsequent reception and controversy within the online community, without conflating it with other UTAU projects or broader themes.