A thumbtack is a small metal object that consists of a parabola with a short, pointy metal spike protruding from its vertex. It is used to temporarily affix paper to an appropriate surface, especially a bulletin board. It recent years, its popularity has waned and it has largely been replaced by pushpins, which are similar objects with a different shape that use more plastic than metal.
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Yes, thumbtack is a compound word made up of 'thumb' and 'tack'.
Loop the string around the thumbtack and the pencil so that the distance from the tack to the pencil point is AB units. Fix the thumbtack to where you want the centre of the circle. Using the pencil, and with the string taut, mark its positions. These will lie on a circle with radius AB.
They both have a point.
The head or the point of the pin? I would measure the head in millimeters and the point of the pin in micrometers.
Get a cup or bottle somethig round orrr... you can stick a hole in the middle with a thumbtack in it with string on the thubtack conected to the pen (or pencil) and go around:)