🌕

🌕︎

1. a full moon
2. (chemistry, text style only) oxygen (Daltonian symbol)

As a symbol for the full moon, this character may be displayed with a face or craters, especially as an emoji. Dalton's symbol for oxygen, on the other hand, is a simple circle. Appending the variation selector ︎ will override emoji formatting. Technically the font color should be set to red, 🌕︎, though it's not uncommon for that detail to be omitted. Another possibility in Unicode for Dalton's symbol is the full or medium 'white' (empty) circles ◯, ⚪︎, depending on which matches the other element symbols in size. (Cf. the symbol 🌑︎ for carbon and notes there for more general Unicode support.)

• (moon): 🌝︎
• (oxygen): ○, ⚪︎