Google Apps Script API
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    An enumeration of the supported glyph types.

    Use the GlyphType enumeration to set the bullet type for list items.

    var body = DocumentApp.getActiveDocument().getBody();
    
    // Insert at list item, with the default nesting level of zero.
     body.appendListItem("Item 1");
    
     // Append a second list item, with a nesting level of one, indented one inch.
     // The two items will have different bullet glyphs.
     body.appendListItem("Item 2").setNestingLevel(1).setIndentStart(72)
         .setGlyphType(DocumentApp.GlyphType.SQUARE_BULLET);
    
    Index

    Enumeration Members

    BULLET: number
    HOLLOW_BULLET: number
    LATIN_LOWER: number
    LATIN_UPPER: number
    NUMBER: number
    ROMAN_LOWER: number
    ROMAN_UPPER: number
    SQUARE_BULLET: number