ShapeWriter (previously known as Shorthand-Aided Rapid Keyboarding (SHARK)) was a keyboard text input method for tablet, handheld PCs, and mobile phones invented by Shumin Zhai and Per Ola Kristensson at IBM Almaden Research Center and the Department of Computer and Information Science at Linköping University. Shapewriter was acquired by Nuance Communications, and taken off the market in 2010., its technology presumably incorporated as part of Nuance's FlexT9 app in 2011.