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2. Channel letter - Wikipedia

   en.wikipedia.org/wiki/Channel_letter

   A standard channel letter is a three-dimensional graphic sign element. Its channel is fabricated from sheet metal, most often aluminum since it will not rust. A flat sheet of aluminum is typically cut on a table by a computer-controlled router, laser, or water jet, based on a vector-based art file (.cdr, .eps, .ai, .scv, .sci, or .fs).

3. United States Army branch insignia - Wikipedia

   en.wikipedia.org/wiki/United_States_Army_branch...

   The first use of Army branch insignia was just prior to the American Civil War in 1859 for use on the black felt hat. A system of branch colors, indicated by piping on uniforms of foot soldiers and lace for mounted troops, was first authorized in the 1851 uniform regulations, with Prussian blue denoting infantry, scarlet for artillery, orange for dragoons, green for mounted rifles, and black ...

4. List of symbols - Wikipedia

   en.wikipedia.org/wiki/List_of_symbols

   List of mathematical constants (typically letters and compound symbols) Glossary of mathematical symbols; List of physical constants (typically letters and compound symbols) List of common physics notations (typically letters used as variable names in equations) Rod of Asclepius / Caduceus as a symbol of medicine

5. Service flag - Wikipedia

   en.wikipedia.org/wiki/Service_flag

   A service flag or service banner is a banner that family members of those serving in the United States Armed Forces can display. The flag or banner is officially defined as a white field with a red border, with a blue star for each family member serving in the Armed Forces of the United States during any period of war or hostilities.

6. List of three-letter broadcast call signs in the United States

   en.wikipedia.org/wiki/List_of_three-letter...

   As of January 2025, there are a total of 101 AM, FM and TV stations in the United States that are assigned three-letter call signs. This is divided between only 67 different three-letter calls, because in many cases the same call sign is used by more than one station, although a given call sign is never assigned to more than one AM, FM or TV ...

7. Military colours, standards and guidons - Wikipedia

   en.wikipedia.org/wiki/Military_colours...

   The rod is attached to the pole by a brass ring, gilt on its lower part, and a 6 cm high cylindrical protective tube of the same material and gilt on its upper part. The ring (3.2 cm high) is inscribed with the name of the unit. Another brass cylinder is placed on the tip of the pole, 6 cm long and of brass.