Hertz measures cycles per second - one Hertz is one cycle per second. Unlike gauss that is a measurement unit for the strenght of a specific thing (an electromagnetic field), hertz is a generic frequency measurement.
Prepend is a word that means to attach content as a prefix. It is often used in different kinds of programming and in automated processes. Some prepending is done manually as a user. For example, a prepend command could be used in a scripting language that a programmer would enter into a certain function or code module. It would add certain characters of text to the beginning of some variable or object.
The append() Function Append Operators The substr() Function Amazon C losely related to += operator are the append() functions which allow you to append a string, a character array, or a character to a string. They work like += operator but they are more powerful in that they allow you to, for example, append multiple identical characters of the given count.