Terms like that can describe a lot of things depending on what one is talking about.
My first reaction would be the notch or depression surrounding an airbag. When pressure of the opening bad is exerted, the notch fractures to release the bag.
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what is a median notch on a dolphin
for low discharge v-notch is more accurate than rectangular notch.
A notch
Score can be a noun or a verb. It is a noun when it is used to refer to the number of points given to a player or team (e.g., the score of the game), a printed copy of a musical composition, or a notch cut into a surface. It is a verb when it is used to refer to the act of making a point in a game, notating a musical composition, or making a notch.
Gauge pressure is what you get when you take the reading from your tire pressure gauge. Absolute pressure is the pressure inside your tires plus the atmospheric pressure, which is roughly; 14.7 psi, 101.3 kPa (kilo-Pascals), or one atmosphere. Absolute pressure measures all of the pressure on your tires, inside and out, whereas gauge simply measures the pressure inside the tire.