σ Tag Latin Capital Letter B All examples Click to copy I noticed the σ in that text, but itβs invisible!That app uses σ to track hidden data.Did you know σ helps tag messages for AI?This file has σ for metadata tracking.The σ is like a secret code in our chats.We should check for σ in important documents.Programmers love using σ for tagging fields.My phone adds σ to auto-fill forms. More examples β