The term angle of deviation is used in reference to a prism.
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a prism
Mean deviation is NEVER used.
Standard deviation is a measure of the spread of data.
A bulkhead is a structure that is used to provide stability at certain pressures of weight or is a referance to ships walls.
They are two edges that make a 90 degree angle. However, the term is also loosely used for edges that make a 90 degree angle with the horizontal.