No official Apple or Unicode emoji design for a separate Black Left Pointing Backhand Index is known. In concept art or proposal-style imagery, it would likely have appeared as a left-facing back of a hand with the index finger extended, wrist on the right, and a solid black or dark filled silhouette similar to older dingbat hands. If adapted into Apple/iOS emoji style, it might have resembled the existing glossy yellow left-pointing backhand index, but with a darker filled appearance in mockups rather than a separate standardized Apple character. Its historical relevance is mainly as a lost or unencoded variant idea connected to directional hand symbols, emoji completion debates, and the long tradition of typographic pointing hands.
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Emoji History The emoji code/ image log of changes.
This emoji was one of the "suggested emojis" the Unicode group unveiled in June 2014 [article], however, it has been, and still is, up to the companies who support emoji in their operating systems to provide not only images but also an algorithm to replace the emoji code into the emoji image.