O Button (blood Type) on Telegram

What it signals here

sticker mapping

Maps to letter and symbol sticker packs; sometimes paired with other button emojis to create custom sticker-text hybrids.

channel use

Used in channel names or post formatting by admins who want bold, visible letter indicators without custom fonts.

group meaning

Appears in group chats to stylize messages or label posts/categories starting with O.

bot context

Sometimes used by bots in inline keyboards or formatted messages as a visual label or category marker.

See it elsewhere