Detail callout
Points to a detail drawn on another sheet. The circle gives the detail's number and the sheet it's on.
Easily confused with
- Section markerMarks where the drawing is cut through to show a section. The arrow shows the way the section looks; the circle gives the section's number and the sheet it's drawn on.
- Elevation markerThe same two-part circle.
- Control room instrumentAn instrument on the main control panel, in the control room. It is drawn as a circle with a solid horizontal line across the middle.
How to read it
In the A/E/C Graphics Standard the detail indicator is a circle that points to an area shown as a detail on the details sheet. The top half holds the detail's identification and the bottom half the sheet number, with a 5 in the sheet-type position for a details sheet, or a 4 for an enlarged area. The VA's CAD guide uses the same digits, with 5 for details.
Also searched as: detail bubble, detail marker.
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
A section marker and an elevation marker use the same two-part circle.
Read next
- Next in Blueprint symbolsGrid line bubbleLabels one of the building's grid lines, the reference lines that locate columns and walls.
- The same shape in Certification marksUSDA Organic sealThe USDA organic seal: the product was certified to US national organic standards and is at least 95 percent organic.
More blueprint symbols
The same shape elsewhere
Browse symbols drawn with circles or letters and numbers.
Sources
- A/E/C Graphics Standard, Release 2.2, ERDC/ITL SR-23-1, U.S. Army Engineer Research and Development Center, CAD/BIM Technology Center, secs. 4.2.4.1, 4.2.4.4
- VHA National CAD Standard Application Guide, U.S. Department of Veterans Affairs, sec. 4, sheet naming
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 24, 2026. How we research
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