Details

The setting CellDingbat->None displays no dingbat.
Dingbats are placed to the left of the main contents of a cell, aligned with the first line of the contents.
By default, dingbats are placed outside of the cell frame, if it exists, at a distance specified by CellDingbatMargin. The dingbat can be moved inside the cell frame by specifying a negative value for CellDingbatMargin.
The setting for CellDingbat can be any string or Cell expression. A typical setting is "\[FilledSquare]".
CellDingbat is often set for styles of cells rather than for individual cells.
The dingbat can be modified interactively using the default toolbar available in Window ▶ Toolbar.

Examples

Create a cell with a small circle dingbat:

Wolfram Language code: CellPrint[TextCell[StringJoin[Table["abcd ", {50}]], "Text", CellDingbat -> "∘"]]

The dingbat goes outside the cell frame if the cell has one:

Wolfram Language code:

CellPrint[TextCell[StringJoin[Table["abcd ", {20}]], "Text", CellDingbat -> "∘", CellFrame -> True, CellMargins -> {{80, 12}, {6, 6}}]]

A dingbat can be many characters long:

Wolfram Language code: CellPrint[TextCell[StringJoin[Table["abcd ", {50}]], "Text", CellDingbat -> "+++++"]]

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