Expertlatin
Q with stroke (Ꝗ, ꝗ) is a letter of the Latin alphabet, derived from writing the letter Q with the addition of a bar through the letter's descender.
What does Q with a bar over it mean?
OverscriptBox[Q, _]
The notation denotes the algebraic closure of the rational numbers . This is equivalent to the set of algebraic numbers, sometimes denoted .
What is letter Q with tilde?
The tilde was also used occasionally to make other abbreviations, such as over the letter ⟨q⟩, making q̃, to signify the word que ("that").
