Historical Orthoepic Clinic • Norman French Scribal Minim Rule
In Wheeler's orthoepic system, the letter o marked with a single dot above (ȯ) represents the short /ʌ/ sound (ȯ = ŭ as in dove, love, come, some).
Historical Scribal Minim Law: Medieval Norman scribes replaced the letter u with o when written next to m, n, v, w (letters made of vertical strokes called 'minims') to prevent visual confusion and make handwriting legible.