We call "jerk" the third order derivative of position with respect to time, that is, the variation of acceleration. Some say that the derivative of jerk with respect to time (the fourth derivative of position with repsect to time) is called "jounce" or "snap".
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.25 acres or One Fourth Acre. There is no official name for it. A quarter-acre.
Seventh wheel
A right angle.
It is a right angle which is 90 degrees.
A fourth degree polynomial can be called a "quartic".