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

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

    The last new three-letter call was assigned to station WIS (now WVOC) in Columbia, South Carolina on January 23, 1930. Since then, three-letter calls have only been assigned to stations, including FM (beginning in 1943) [1] and TV (beginning in 1946), [2] which are historically related to an AM station that was originally issued that call sign.

  4. ISO 3864 - Wikipedia

    en.wikipedia.org/wiki/ISO_3864

    ISO 3864-3:2012 Part 3: Design principles for graphical symbols for use in safety signs [3] ISO 3864-4:2011 Part 4: Colorimetric and photometric properties of safety sign materials [ 4 ] Part 1 explains how to layout the components of safety signage, dictate the color scheme and sizing information.

  5. 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

  6. Placard - Wikipedia

    en.wikipedia.org/wiki/Placard

    A placard is posted on buildings to communicate a wide variety of information, such as fire safety policies, emergency shelters. The International Building Code requires doors in some public and commercial structures, fitted with an internal key lock have a notice "This door to remain unlocked when this space is occupied" in a minimum of 1 inch (25 mm) text be posted beside or above the door. [2]

  7. Rail Alphabet - Wikipedia

    en.wikipedia.org/wiki/Rail_Alphabet

    Rail Alphabet is similar to a bold weight of Helvetica, but with some differences in character shapes, [3] stroke width and x-height to aid legibility. The typeface also has some similarities to Akzidenz-Grotesk, which had earlier provided the same designers the broad inspiration for the Transport typeface used for road signs in the United Kingdom.

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