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In the United States a longer duty cycle is used, 50% for battery -powered buoys (20 seconds on, 20 seconds off) and 75% for on-shore beacons. Ramarks are wide-band beacons which transmit continuously on the radar bands without having to be triggered by an incoming radar signal.
ISO 3166-1 (Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest.
Delay code properties cover nine category sets for delay. Each category set can be described using either a two-digit number code or a two letter alpha code; most airlines use the numeric format, but some prefer the alpha.
Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
In Electrical Power Systems and Industrial Automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments. The device numbers are enumerated in ANSI/ IEEE Standard C37.2 "Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations" .
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.
This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage, and some of the three-letter codes of the other sets, formerly parts 2 and 3.
This list is based on the official standard, but includes defunct codes and historical changes, including the derivation of the two letter identities, in cases where known.
Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay .
Officially assigned code elements. The following is a complete list of the 249 current officially assigned ISO 3166-1 alpha-2 codes, with the following columns: [1] Code: ISO 3166-1 alpha-2 code, pointing to its ISO 3166-2 article.