Arrow notation (disambiguation)

Arrow notation or up-arrow notation is a widely used notation for the hyper operators, devised by Donald Knuth.
Arrow notation may also refer to:
*Down-arrow notation (↓), a left-associative extension for addition, multiplication and exponentiation
*Conway's chained arrow notation (→), an extension of up-arrow notation invented by John H. Conway
*Mixed arrow notation (↑↓), a bidirictional combination of up- and down-arrow notations
*irrational arrow notation (↑c(Δ)), an irrational extension of up-arrow notation