# Data Type - Scalar Variable

A scalar variable is an atomic quantity that can hold only one value at a time

A scalar function returns a scalar.

The contrary of scalar variable are collections.

A scalar multiplication is usually use to scale

Usually a scalar is a single number (Real Number as Scalar)

Not to confound with the term scalar that design a Variable.

## Visualisation

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A gauge is a metrics type that holds or return a single value (numeric or textual) where changes can only be observed in random order (increasing or decreasing order) or Gauge values are not...