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# Additional Writing Directions

Constants that specify additional options when setting the writing direction of attributed strings.

## Discussion

You can use the logical `OR` operator to combine these constants with [`NSWritingDirection.leftToRight`](/documentation/AppKit/NSWritingDirection/leftToRight) or [`NSWritingDirection.rightToLeft`](/documentation/AppKit/NSWritingDirection/rightToLeft) when used with <doc://com.apple.documentation/documentation/Foundation/NSAttributedString/Key/writingDirection> to specify formatting controls defined by the Unicode Bidirectional Algorithm in Unicode Standard Annex #9.

## Topics

### Constants

[`var NSTextWritingDirectionEmbedding: Int`](/documentation/AppKit/NSTextWritingDirectionEmbedding)

Text is embedded in text with another writing direction.

[`var NSTextWritingDirectionOverride: Int`](/documentation/AppKit/NSTextWritingDirectionOverride)


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