Concrete
Marks concrete in a section or plan. The dots and small triangles are the conventional pattern for concrete.
Easily confused with
How to read it
The Army's print-reading manual lists concrete among its material conventions, the patterns that show what a structure is made of, and chooses each pattern to suggest a characteristic of the material where it can. The Navy's Builder Basic course shows the same conventional symbols for the common materials.
Also searched as: concrete hatch, concrete pattern.
This explains what a symbol represents on a drawing. Conventions vary between firms and standards, and a drawing's own legend takes precedence.
Look-alikes
Earth and brick have their own patterns. Concrete masonry units have a separate one in the Army manual.
Read next
- Next in Blueprint symbolsBrickMarks brick masonry in a section or plan, drawn as evenly spaced diagonal lines.
- The same shape in North and Central American flagsFlag of El SalvadorEl Salvador’s flag has blue, white and blue horizontal stripes, the colours of the old Central American federation, with either the coat of arms or the motto “Dios, Unión, Libertad” on the white. The 1972 law on the national symbols describes the flag and gives the colours no meaning; El Diario de Hoy reports that by the official description the blue stands for the two oceans that wash Central America and the white for peace.
More blueprint symbols
The same shape elsewhere
Browse symbols drawn with squares and rectangles or triangles.
Sources
- Construction Print Reading in the Field, TM 5-704 / AFM 85-27, Departments of the Army and the Air Force, para. 2-2b; fig. 2-2
- Builder Basic, NAVEDTRA 14043A, Naval Education and Training Command, U.S. Navy, ch. 3, fig. 3-10
- Reading Architects' Blueprints, William S. Lowndes, 1922, International Textbook Company, Scranton (Internet Archive), §5, arts. 48–49
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 24, 2026. How we research
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