U+27DF "⟟" Up Tack with Circle Above Unicode Character

U+27DF "⟟" Up Tack with Circle Above is a rarely used typographic or mathematical symbol that combines a vertical upward-pointing stick, known as a tack, with a small hollow circle placed above it, typically representing a specific logical relation, operator, or notation within specialized formal systems such as advanced logic, set theory, or type theory, though its primary function is notation rather than common usage.