Combining Latin Small Letter O

Combining Latin Small Letter O is a combining diacritical mark, meaning it doesn't stand alone — it attaches to whichever character comes immediately before it in the text, visually merging to form an accented letter or annotated symbol.

Unicode block: Combining Diacritical Marks (U+0300–U+036F). Combining marks are "zero-width" characters that attach to the previous letter to add an accent, rather than existing as their own visible glyph — this is how Unicode builds accented letters that don't have a precomposed code point.

At Unicode code point U+0366 (decimal 870), Combining Latin Small Letter O is the 103rd of 112 characters cataloged in this category on How To Type Any Symbol. In terms of typing methods, like most characters outside the 0–255 legacy codepage range, it has no dedicated Alt-code or single-key shortcut on Windows or Mac, so copy-paste is the standard, universal method for typing it. Regardless of platform, clicking the copy button above places the exact character on your clipboard, ready to paste into any application that accepts Unicode text.

💡 Good to know: Combining marks can behave unpredictably in text fields that don't fully support Unicode normalization — test carefully before using them in usernames, filenames, or database keys.