Delegates are written in PascalCase.
When declaring delegates, DO add the suffix EventHandler to names of delegates that are used in events.
BAD:
public delegate void Click()
GOOD:
public delegate void ClickEventHandler()
DO add the suffix Callback to names of delegates other than those used as event handlers.
BAD:
public delegate void Render()
GOOD:
public delegate void RenderCallback()
Using built.in C# features, such as Action, is encouraged in place of delegates.