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A circle around an area, referring to a larger drawing.
Also known as: Detail reference symbol, Detail bubble symbol, Enlargement callout
On an architectural drawing a detail callout is a circle or rounded outline drawn around part of the drawing, referring the reader to a larger-scale drawing of that part.
Marks an area drawn again at larger scale elsewhere in the set, and names where to find it.
Contexts: Technical drawing
Is how a drawing set carries several scales at once without any one sheet becoming unreadable.
Contexts: Technical drawing
A circle or rounded outline enclosing an area of the drawing, with a leader to a tag naming the detail and its sheet.