letter O
Alphabet's fifteenth character
The fifteenth letter of the English alphabet.
Letter O often appears in phrases emphasizing sequence or spelling: It's spelled with two O's.
The letter's round shape makes it useful for describing circular things or marking spots: Draw a big O on the map.
In grading systems, O sometimes stands for outstanding.
As an exclamation, O is a literary or archaic form of oh, used in direct address: O captain, my captain.
- ovalElongated rounded shape
- zeroNumerical absence of quantity
- circleCurved closed shape
- roundCurved like circle
- ringClosed curve shape
vowel · alphabet · omega · letter opener · orb · orbit · opening · open sesame · octopus · orange · oxygen · omit · oscillate · ocean · olive · olive oil · opera · opera house