The Deckchair is a sex position that is so named because your bodies in this position resemble a deckchair.
To get into this sex position, the penetrating partner in this position sits on the bed or floor and leans back, supporting themselves with their hands. The receiving partner then lies on their back between the spread legs of the penetrating partner. With the receiving partner's pelvis in front of the penetrating partner, penetration can occur.
The Deck Chair position may also be known as the Lounge Chair position.