Formation of geese (3)

I believe the answer is:
vee
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">formation of geese</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vee that I've seen before include "Shape resembling the twenty-second letter" , "Character" , "22nd letter of the alphabet" , "Angled mark or notch" , "Letter; notch shape" .)