A schematic representation of a sequence of subroutines designed to solve a problem; it is a coarser and less symbolic representation than a flow chart, frequently including descriptions in English words.

1. A line drawing that represents an object or area according to a scale.

2. A graph which shows the relation between two variables or which plots the occurrence of events or objects as a function of two variables.

A picture in which sets are represented by symbols and mappings between these sets are represented by arrows.