Formerly, the term "power" referred to an instrument signed under seal while a "letter" was an instrument under hand, meaning that it was simply signed by the parties, but today a power of attorney does not need to be signed under seal. Some jurisdictions require that power of attorney be notarized or witnessed, but others will enforce a power of attorney as long as it is signed by th... https://www.corpzo.com/what-is-the-difference-between-general-and-special-power-of-attorney