Omicron Delta Kappa has announced the appointment of Tara Singer as executive director.
From the orlandosentinel.com
Omicron Delta Kappa, a national leadership and scholarship honorary society, is the sponsor.
From the kentucky.com
Omicron Delta Kappa is a national leadership honor society.
From the stltoday.com
You were right omicron should not be omitted.
From the en.wikipedia.org
The provenance of omega is not known, but it is generally assumed to derive from omicron with a line drawn under it.
From the en.wikipedia.org
Again it's cognate with Greek oinos, which did indeed in early times have a form with an initial digamma, but I can't find in Liddle and Scott any trace of a form omitting the omicron.
From the en.wikipedia.org
Omicron Delta Kappa was the first college honor society of a national scope to give recognition for meritorious leadership and service in extracurricular activities.
From the orlandosentinel.com
More examples
The 15th letter of the Greek alphabet
Omicron is a quite diverse neotropical genus of small potter wasps.
The name for the 15th letter of Classical and Modern Greek. The 16th in Ancient and Old Greek