Indic Positional Category - Left And Right

Left And Right is a specific value within the Indic Positional Category, used to describe how certain vowel signs or diacritical marks attach to a consonant base in scripts like Devanagari or Bengali. This category applies when a mark appears on both the left and right sides of the base character simultaneously, such as with some independent vowels or complex ligatures that flank the consonant. It indicates that the visual rendering requires placement on both horizontal sides, unlike values like Left or Right alone, which position the mark on only one side. This distinction is crucial for shaping engines to correctly reorder and render glyphs in complex text layout, ensuring that the combined marks align properly without overlapping the central letterform.