Seat

The term may encompass additional features, such as back, armrest, head restraint but also headquarters[clarification needed] in a wider sense.

Possibly related to or cognate with Old Norse sæti.

[1] For someone seated, the 'buttock popliteal' length is the horizontal distance from the rearmost part of the buttocks to the back of the lower leg.

[2] This anthropometric measurement is used to determine seat depth.

Mass-produced chairs typically use a depth of 15 to 16 inches (38.1 to 40.6 cm).