divider
US /dɪˈvaɪ.dər/
UK /dɪˈvaɪ.dər/

1.
a person or thing that divides or separates something
:
•
The wall acts as a divider between the two rooms.
•
She used a room divider to create a private space.
2.
3.
a pair of compasses with very sharp points, used for measuring distances on maps or for dividing lines into equal parts
:
•
The cartographer used a divider to accurately measure the distance between two cities on the map.
•
Architects often use dividers for scaling drawings.