Oo

Oo, that's cold!

For instance, the sound of -u — described in the phrase, “like -u in ‘plural’” — may well be pronounced like -oo in ‘good’ or in ‘loom’ but not like -u in ‘stutter’ or in French ‘lune.’

Then came ther downe goodly ladyes tweyne […] And seyde, the gret Alpha & Oo most souereyne […] had hem thedyr sent.

On this visit I made careful inquiries as to the success of Mr. Gay's efforts to raise the "Oo" bird on this island.

Several years earlier, she had arranged to bring three pairs of the rapidly vanishing ʻōʻō bird from Hawai‘i island to Kaua‘i, hoping they would form a new colony.