There are many systems. A system is a collection of units which are used together. The two commonest are the SI units, based on the metric system, and imperial units (feet, pounds etc.)
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The two most common systems of units are cgs and SI systems
SI units describes the metric system units that are used in scientific data.
The standard unit that is the same in all systems of units is the second, which is the base unit for measuring time.
There are thousands of measurement units in both systems and it is not possible to list them all.
The unit of temperature, Celsius, is a part of both the US and metric systems. In the US, Fahrenheit is also commonly used for temperature measurements.