https://codetofun.com/html/entity/bidirectional-arrow-block
HTML Entity for Bidirectional Arrow Block (↹) — Hex, Decimal, CSS & Unicode | CodeToFun
Sep 22, 2026 - Clear study guide for the bidirectional-arrow-block HTML entity: Unicode U+21B9, hex ↹, decimal ↹, CSS \21B9, live preview, worked examples with explanations,...
html entityarrow blockbidirectionalhexdecimal