Notation is the system of symbols and rules that you use to represent your algorithm. It can include variables, constants, operators, functions, data structures, pseudocode, flowcharts, diagrams ...

ER diagrams have a proven track record to rep-resent data structure and relationships, in many CS problems, beyond relational databases. The ER diagram strengths are abstraction, generality, ...

The Systems Biology Graphical Notation (SBGN) is a graphical representation crafted over several years by a community of biochemists, modellers and computer scientists.