Indic Positional Category - Bottom And Left

Bottom And Left is a positional category used in script shaping to indicate that a dependent vowel sign or similar mark should be placed at the bottom of the base consonant and also extended to its left side, typically when the vowel follows a consonant cluster or in specific orthographic contexts. This placement often occurs in scripts like Devanagari or Bengali for certain vowel forms that wrap around the base, ensuring the mark sits below the main character while its leftward portion attaches to the preceding glyph. The value governs how the mark connects visually, preventing overlap and maintaining legibility within a syllable. It applies only to combining characters, not to standalone letters, and is determined by the script’s inherent rules for vowel positioning.