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2. ANSI device numbers - Wikipedia

   en.wikipedia.org/wiki/ANSI_device_numbers

   In electric 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 .

3. Tire code - Wikipedia

   en.wikipedia.org/wiki/Tire_code

   2-digit number: The diameter of the tire in inches. x: Separator character. 3- or 4-digit number: The section width (cross-section) of the tire in inches. If the tire diameter is not given, section widths ending in zero (e.g., 7.00 or 10.50) indicate the aspect ratio of 92%, while section widths not ending in zero (e.g., 7.05 or 10.55) indicate ...

4. International Code of Signals - Wikipedia

   en.wikipedia.org/wiki/International_Code_of_Signals

   Two-letter signals for other messages, sometimes followed with a numerical "complement" which supplements or modifies the message. Three-letter signals beginning with "M"; these are the Medical Signal Codes. In some cases, additional characters are added to indicate quantities, bearing, course, distance, date, time, latitude, or longitude.

5. International maritime signal flags - Wikipedia

   en.wikipedia.org/wiki/International_maritime...

   Letter flags and ICS meanings Letter / radio name Flag Blazon ICS meaning as single flag Meaning when used with numeric complements A Alfa: Swallowtailed, per pale argent and azure "I have a diver down; keep well clear at slow speed." Azimuth or bearing B Bravo: Swallowtailed, gules "I am taking in or discharging or carrying dangerous goods."

6. Q code - Wikipedia

   en.wikipedia.org/wiki/Q_code

   The Q-code is a standardised collection of three-letter codes that ... What is your true bearing? ... "ZBW 2", which means "change to backup frequency number 2", and ...

7. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Rolling bearings; single row radial contact ball bearings: Active: DIN 625-3: Rolling bearings; double row radial contact ball bearings: Active: DIN 625-4: Rolling bearings; radial contact groove ball bearings with flanged outer ring: Active: DIN 653: Knurled thumb screws, low type: Active: DIN 678-1: Envelopes – Part 1: Sizes: Active: DIN 678-2