Bollard

 A bollard is a short vertical post or pillar, typically made of metal or concrete, that is used to control or restrict vehicle or pedestrian access to a specific area. Bollards can be found in a variety of settings, including on sidewalks, in parking lots, and around public buildings. They are often used to prevent vehicles from driving onto pedestrian walkways or to protect buildings and other structures from accidental collisions.

Bollards come in many different sizes and shapes, and can be fixed or removable. Fixed bollards are typically permanently installed in the ground and cannot be moved, while removable bollards can be taken out and replaced as needed. Some bollards are also equipped with lights or reflectors to improve visibility at night. Bollards can be a simple but effective way to manage traffic flow and improve safety in public spaces.