ISO 4217 (MA), SIX Interbank Clearing, is responsible for maintaining the list of codes. The following is a list of active codes of official ISO 4217 currency names. In the standard the values are called "alphabetic code", "numeric code", and "minor unit". The US dollar has two codes assigned: USD and USN (next day). The USS (same day) code is not in use any longer, and was removed from the list of active ISO 4217 codes in March 2014. According to UN/CEFACT recommendation 9, paragraphs 8–9 ECE/TRADE/203, 1996, available online: As of August 2018, there are no new codes planned to be
ISO 80000-1 "P". Annex C introduces the concepts of "power quantities" and "root-power quantities", and deprecates "field quantity". ISO 80000-1 ISO 80000-1:2009 is a standard describing scientific and mathematical quantities and their units. The standard, whose full name is "Quantities and units Part 1: General" was developed by the International Organization for Standardization (ISO), superseding ISO 31-0. It provides general information concerning quantities and units and their symbols, especially the International System of Quantities and the International System of Units, and defines these quantities and units. It is a part of a group of standards called ISO/IEC 80000. The standard is divided