Meaning
A triangle pointing right, usually inside a square, the universal play button. It means start playing a video or song, and by extension start, go or next.
It sits in front of video links, livestream announcements and step-by-step lists, where it doubles as a bold bullet point: “▶️ New vlog is up, link in bio” Shops often line up a column of ▶️ to list prices and addresses. For a plain arrow without the button look, ➡️ is the alternative.