> ## Documentation Index > Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt > Use this file to discover all available pages before exploring further. # Creating a Machine-Readable Form/Checkmark Field > Checkmark fields are machine-readable form elements, usually check boxes, that respondents mark; squares, circles, and underlines are common shapes. A **checkmark field** is an element of a machine-readable form (usually a square called a "check box") in which a mark should be made by the person who completes the form. A checkmark field usually has an accompanying text which explains the use of the checkmark.

Possible shapes of checkmark fields are shown in the table below | Square |

| | --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Circle |

| | Underline |

| Other shapes are also possible, e.g. polygons, ovals, etc.