Detail callout
Points to a detail drawn on another sheet. The circle gives the detail's number and the sheet it's on.
This explains what a symbol represents on a drawing. Conventions vary between firms and standards, and a drawing's own legend takes precedence.
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.
Look-alikes
A section marker and an elevation marker use the same two-part circle.
More blueprint symbols
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
Last reviewed September 24, 2026 by Rory Hansen. How we research