Consisting of graphemes, most modern ones trace their lineage back to Proto-Canaanite, which was itself derived from Hieratic.
Nüshu is one of these constructs that was used secretly among women in Hunan, China for centuries. The Arabic one was famously defective in its early years, which prompted the dot reform during the Islamic period. Traditionally, Sejong the Great is said to have created the Korean one of these and published it in the Hunminjeongeum in 1446. An example of the abugida variety is Ge'ez, although it existed as an abjad before Christianization circa 350. Consisting of graphemes, most modern ones trace their lineage back to Proto-Canaanite, which was itself derived from Hieratic. Including phonetic varities such as Devanagari as well as logographic varieties such as kanji, alphabets are a type of, for 10 points, this general term for a method of recording language graphically. 
Nüshu is one of these constructs that was used secretly among women in Hunan, China for centuries.
{writing system} [{also} accept {orthography}; accept {alphabet because} of the {Korean} clue]