Definitions for "Vertical frequency"
This is also called the vertical refresh rate, or the vertical scan frequency. It is a monitor term that describes how long it takes to draw an entire screenful of lines, from top to bottom. Monitors are designed for specific vertical and horizontal frequencies. Vertical frequency is a key factor in image flicker. Given a low enough vertical frequency (53 Hz, for example) nearly everyone will see a flicker because the screen isn't rewritten quickly enough. A high vertical frequency (70 Hz on a 14-inch monitor) will eliminate the flicker for most people.
Number of [ TV] frames transmitted per second.
Indicates, how many frames per second can be displayed (refresh rate, in Hz).