Used for visible outlines and edges.
What are you drafting for? (e.g., mechanical, structural, or architectural) Used for visible outlines and edges
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: Specifies how to efficiently represent identical components or features without drawing every instance. Standardized Symbols Overview Application Example ∅the empty set Placed before the numerical value for circles or cylinders. Placed before the dimension for parts of a circle. Indicates width across flats of a square section. SR Spherical Radius Used for the radius of a spherical surface. ↓down arrow Indicates the depth of a specific feature like a hole. Availability and Official Sourcing AS 1100.101-1992 Technical Drawing - General Principles Placed before the dimension for parts of a circle