Divisi
In music, the word unison can be applied in more than one way. In general terms, it may refer to two notes sounding the same pitch, often but not always at the same time; or to the same musical voice being sounded by several voices or instruments together, either at the same pitch or at a distance of one or more octaves; or to rhythmic patterns which are homorhythmic.
Read more about Divisi: Interval of The Unison, "In Unison", Synthesizer