You need to specify the thread. Though most are between 55 and 60 degrees.
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http://billiards.colostate.edu/threads/banks_and_kicks.html
When the beginning ray of the angle is on the x-axis.
A thread angle is the angle of the threads relative to the shank which is 60 degrees for unified screws The lead angle is the pitch of the screw divided by the circumference of the shank; it varies but is around 3 degrees
A standard sheet of paper has a right angle at each corner.
On a standard wall clock, 4:00 is an obtuse angle.