There are different ways to spell "OSSCO", but the most common is [ˈɔskoʊ]. The first sound, [ɔ], is the rounded open back vowel, similar to the "o" in "dog". The second sound, [sk], represents the voiceless alveolar fricative, like the "s" in "snake". Finally, the sound [oʊ] is the diphthong "ow", as in the "o" of "bow" and the "w" of "tower". Therefore, "OSSCO" is spelled with the letter "o" and the letter combination "ss" for the /sk/ sound.