Bolster

[Sarah]

A long pillow or cushion, used to support the head of a
person lying on a bed; -- generally laid under the pillows.

[Jason Yan]

A [cylindrical] [cushion] used to fill [the space] that wouldve been taken by another human being.

[Lanell]

We bolster the internet by preventing account takeovers and other forms of online fraud. A software product by Bolster