device

Any clever maneuver.

“he would stoop to any device to win a point”

An emblematic design (especially in heraldry).

“he was recognized by the device on his shield”

An instrumentality invented for a particular purpose.

“the device is small enough to wear on your wrist”

“a device intended to conserve water”

Any ornamental pattern or design (as in embroidery).

Something in an artistic work designed to achieve a particular effect.