The owl is used for the "M" sound in words like man and mask and names like Michael and Mary.
The wave is used for the "N" sound in words like north and night, and names like Nicole and Nicholas.
There are two hieroglyphs used for the letter "O". They represent the different sounds of the letter.
The quail chick is used for the long 'O', 'oa' and 'oo' sounds in words like overcoat and wood and names like Olivia.