What is "doxastikon"

A Doxastikon ( Greek: Δοξαστικόν "Glory sticheron")—plural: doxastika— is a type of hymn found in the Divine Services of the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite.

Specifically, a doxastikon is a sticheron which is chanted after or between:

• Δόξα

"Glory to the Father, and to the Son, and to the Holy Spirit."

and

• Καὶ νῦν

"Both now and ever and unto the ages of ages. Amen."