The flap on the back of a shirt is commonly referred to as a "yoke." It is a piece of fabric that provides structure and support to the garment, often found at the shoulders. In some styles, like Western shirts, it can also serve a decorative purpose.
valve
It is also called an attached flap.
The flap of skin at the elbow is called a wenus.
Flap caps or Painters Caps with flaps
The flap that covers the nasal tract is called the epiglottis. It is a cartilaginous structure at the back of the tongue that covers the opening to the larynx during swallowing to prevent food from entering the airway.
Venous valves .
The flap on the inside of a paperback book is usually called the cover flap or dust jacket flap. It typically contains information such as a brief summary of the book, author bio, and publisher details.
The flap is called a wattle. A bright, big wattle is the sign of a healthy chicken
Womens dresses were originally designed to be buttoned by others, since the buttons were down the back. If you are used to buttoning for yourself, the buttons need to be a mirror image of your own for when you button for someone else.,
uvula
The button on the back collar of a shirt is called a collar button. It helps the collar keep its shape and stay in place, giving the shirt a more polished look. It can also provide extra support for ties or bowties.
It is called the Palatine uvula, and helps us articulate our vocal sounds into human speech. It also helps break down your food.