The Ark’s opening through which Noah could see outside is called a window in Genesis.
Genesis 8:6 says that after forty days Noah opened the window of the Ark. He then sent out the raven and later the dove to observe whether the waters had receded. The opening is therefore part of the narrative’s testing sequence after the flood’s peak.
Genesis 6:16 also mentions a window while giving the Ark’s construction instructions, alongside the door and the three decks. English translations vary slightly in how they render details of the window’s placement and design, but “window” is the standard answer to the narrative question.
Modern reconstructions sometimes interpret the opening as a roof vent, hatch, or broad skylight. Those are architectural proposals rather than terms directly established by the English biblical text. The story specifically identifies Noah opening a window before releasing the birds.