Caesura
/siˈzjʊrə/
Definition 1 of 2
Pro Tip 1/3Poetry Rhythm
A caesura affects the rhythm and flow, creating a natural pause for effect. 
The line 'To be, :: or not to be' employs a caesura for contemplative pause.
Pro Tip 2/3Silent Beat
In reading poetry, treat a caesura like a silent beat, giving readers time to think. 
'The time is now :: we must act' uses a caesura for emphasis.
Pro Tip 3/3Middle Pause
Caesura usually appears in the middle of a line but can vary to create different effects. 
'A hero arises - :: brave and true' uses an early caesura for dramatic effect.