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.
An addendum, in general, is an addition required to be made to a document by its author subsequent to its printing or publication.It comes from the Latin verbal phrase addendum est, being the gerundive form of the verb addo, addere, addidi, additum, to give to, add to, meaning (that which) must be added.n other documents, most importantly in legal contracts, an addendum is an additional document not included in the main part of the contract. It is an ad hoc item, usually compiled and executed after the main document, which contains additional terms, obligations or information.