Triple Demi (also known as DDD, Triple D, Demdemdem, DemiDemiDemi, Demi3, or D3) describes someone who is demisexual, demiromantic and demigender at the same time. They are simultaneously demisexual, demiromantic, and demigender/on demigender spectrum. They can identify as other terms as well, such as being demibisexual, demihomoromantic, and demigirlflux, for example.
It is similar to aroace agender, which is sometimes referred to as Triple A.
The term was coined on March 9th, 2021 by FANDOM user Zer0Rebel4. The flag was created at the same time. The flag is a mix of the demisexual, demiromantic and demigender flags.