The visible side of the watch where the dial is contained, most are printed with Arabic or Roman numerals. Note: traditionally IIII, rather than IV, is used to indicate the 4 o'clock position.
In a chronograph with analogue display, an additional center second which can remain superposed on the other as it moves, can be stopped indepently and then made to "fly back" so as to catch up with the other hand, can be stopped and reset to zero together with the other hand. In chronographs with numeral display, a "function" having the same effect.
The number of vibrations a second, in hertz (Hz).
