What is another word for threshold function?
Pronunciation: [θɹˈɛʃə͡ʊld fˈʌŋkʃən] (IPA) 
A threshold function is a mathematical function that returns a binary output based on whether the input exceeds a certain threshold or not. There are several synonyms for the term "threshold function" such as step function, Heaviside step function, unit step function, and binary step function. The step function describes a piecewise function that has a constant value in each interval. The Heaviside step function is named after Oliver Heaviside, an English mathematician, and electrical engineer, and it is a mathematical function that gives the value zero for negative input and one for positive input. The unit step function is also a synonym for the threshold function that returns a value of zero for negative inputs and one for positive inputs. Finally, the binary step function is a type of step function that has a value of zero or one, as opposed to real-valued outputs.
