That’s a *rolling swivel stool*, usually called a “saddle stool” or “work stool”.
*Main function*: It lets you sit at work height and move around easily without getting up.
You’ll see these used in:
- *Salons/barber shops* – stylists roll around clients while cutting/hair treatment
- *Clinics/dental offices* – doctors roll between patient and equipment
- *Workshops/labs* – for tasks at benches or tables where you need to shift position often
- *Nail/manicure stations* – nail techs use them to get close to hands/feet
Key features you can see in your pic:
- *Wheels/casters* – roll smoothly on tile/floor
- *Height adjustment lever* on the side – pump it to raise/lower the seat
- *Swivel seat* – spin to reach different areas
- *Foot ring* – rest your feet for comfort during long use