γγ is a helper godan verb. It tells us that something is indicated as being the case.1
Example: Yui is showing signs of wanting cake
γγγγ±γΌγγγ»γγγ
Info
In this example, γγ (Yui) is the core of the sentence marked with γ.
γ±γΌγ is marked with γ, making it the object.
The adjective of desire γ»γγ has the γ removed and replaced with γγ, making it into a verb meaning βto show signs of desireβ.