GD&T · Orientation · ASME Y14.5
Angularity GD&T Symbol — Meaning and Datum Rule
https://shopmath.org/gdt/angularity · data verified August 1, 2026
Angularity (∠) is a GD&T orientation control, and its tolerance zone is two parallel planes (or a cylinder, for an axis) at the basic angle. It always references a datum.
- Symbol
- ∠
- Unicode
- U+2220
- Category
- Orientation
- Datum
- always
Angularity · GD&T orientation symbol
∠
- Unicode
- U+2220
- Datum
- always
- Zone
- Two parallel planes (or a cylinder, for an axis) at the basic angle
The value in the feature control frame is the width or diameter of that zone, in the drawing's units.
What Angularity Controls in GD&T
Holds a surface or axis at a specified basic angle to a datum. The zone is tilted to that exact angle and the feature must stay inside it; the angle itself is basic and never carries its own plus/minus tolerance.
The Angularity GD&T Symbol, Zone and Datum Rule
The symbol as it appears in the feature control frame, with the codepoint to type it and the rule it carries.
| Property | Value |
|---|---|
| Symbol | ∠ |
| Unicode codepoint | U+2220 |
| Category | Orientation controls — Control the angle of a feature relative to a datum, but not its distance. |
| Tolerance zone | Two parallel planes (or a cylinder, for an axis) at the basic angle |
| Datum reference | Always references at least one datum. Without a datum reference frame the callout is incomplete and the drawing is ambiguous. |
| Standard | ASME Y14.5 (cited, not reproduced); ISO 1101 |
| Also called | angle tolerance gdt |
The symbol character is the Unicode codepoint used in drawings and CAD annotations; drafting standards render it with defined proportions that the font approximates.
Sources and Method for the Angularity GD&T Reference
- Angularity symbol and rulescompiled
Symbols and codepoints: Unicode Character Database (Unicode License v3). Characteristic list cross-checked against NASA MSFC GD&T Basics (public domain). Descriptions written from scratch; no ASME Y14.5 text reproduced.
Verified against Unicode Character Database codepoint check; 98/98 structural checks passed
Compiled from independent public sources that agree cell-for-cell.
- Assumptions
- The standard is cited, never reproduced: no ASME Y14.5 definitional text, worked example or figure appears on this site. The description above is original prose.
- ASME Y14.5 and ISO 1101 differ in places — the ISO system uses the envelope requirement differently and does not carry every ASME modifier. Where a drawing names a standard, that standard governs.
- Dataset scope: EXCLUDED: all ASME Y14.5 definitional text, worked examples and figures. Every description on this site is original prose.
- Data last verified
- August 1, 2026
How to Cite This Angularity GD&T Reference
Citation
ShopMath. "Angularity GD&T Symbol — Meaning and Datum Rule." ShopMath, verified August 1, 2026, https://shopmath.org/gdt/angularity
BibTeX
@misc{shopmath-gdt-angularity,
title = {Angularity GD&T Symbol — Meaning and Datum Rule},
author = {{ShopMath}},
year = {2026},
howpublished = {\url{https://shopmath.org/gdt/angularity}},
note = {Data verified 2026-08-01}
}Permanent URL
https://shopmath.org/gdt/angularity
Common Questions About Angularity in GD&T
What does Angularity mean in GD&T?
- Holds a surface or axis at a specified basic angle to a datum. The zone is tilted to that exact angle and the feature must stay inside it; the angle itself is basic and never carries its own plus/minus tolerance.
What is the Angularity symbol in GD&T?
- ∠ — Unicode U+2220. It goes in the first compartment of the feature control frame, ahead of the tolerance value.
Does Angularity need a datum?
- Always references at least one datum. Without a datum reference frame the callout is incomplete and the drawing is ambiguous.
What shape is the Angularity tolerance zone?
- Two parallel planes (or a cylinder, for an axis) at the basic angle. Every point of the controlled feature has to lie inside that zone for the part to pass.
Which GD&T controls are in the same group as Angularity?
- Angularity is one of 3 orientation controls: Angularity, Perpendicularity, Parallelism.