> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/einheiten.md).

# Units

In connection with [key figures](/acron-9.3/en/anlagenkonfiguration/verfahrensgroessen/kennzahl.md)/[key figure templates](/acron-9.3/en/anlagenkonfiguration/kennzahlvorlagen.md), and the facility to automatically convert units for [process variables](/acron-9.3/en/anlagenkonfiguration/verfahrensgroessen.md), it is necessary to work with standardized units. This means only the units present in the Units area can be used in the input boxes for units. In addition to the units predefined in that area, it is also possible to add required units to the individual categories, or to create additional user-defined categories and units.

For the system of units in ACRON, in addition to the base units of the international SI system derived units are also used as base units.

## Category <a href="#kategorie" id="kategorie"></a>

Base unit under which the fractions and multiples of the respective [unit](/acron-9.3/en/anlagenkonfiguration/einheiten/basiseinheit_kategorie/einheit.md) are grouped.

Note

The 'Lengths' category, for example, includes the fractions and multiples of the base unit meter, such as mm, cm, km. etc.

## Icons

| Icon                             | Meaning                                                            |
| -------------------------------- | ------------------------------------------------------------------ |
| ![](/files/l5DhN1X93aH1Hgj09Beq) | ACRON Default directory that cannot be renamed, copied or deleted. |
| ![](/files/9Dpc0BrZiJl1gnDhVcGU) | Non-editable ACRON unit Non-editable ACRON category                |
| ![](/files/YRBmzRhfUUjlMZdU8xcv) | User-defined unit User-defined category                            |

### Name <a href="#bezeichnung" id="bezeichnung"></a>

Name of the category


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