---
type: "gdt-symbol"
name: "Angularity"
symbol: "∠"
unicode: "U+2220"
category: "orientation"
category_name: "Orientation controls"
datum_required: "always"
tolerance_zone: "Two parallel planes (or a cylinder, for an axis) at the basic angle"
aliases: ["angularity gdt", "angle tolerance gdt"]
standard: "ASME Y14.5 (cited, not reproduced); ISO 1101"
verified: "August 1, 2026"
url: https://shopmath.org/gdt/angularity
---

# Angularity (∠) — GD&T Symbol, Tolerance Zone and Datum Rules

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.

- **Symbol**: ∠ (Unicode U+2220)
- **Category**: Orientation controls
- **Tolerance zone**: Two parallel planes (or a cylinder, for an axis) at the basic angle
- **Datum reference**: always references at least one datum
- **Standard**: ASME Y14.5 (cited, not reproduced); ISO 1101

## Angularity at a Glance

| Property | Value |
| --- | --- |
| Characteristic | Angularity |
| Symbol | ∠ |
| Unicode codepoint | U+2220 |
| Category | Orientation controls |
| Tolerance zone | Two parallel planes (or a cylinder, for an axis) at the basic angle |
| Datum reference | always references at least one datum |
| Standard | ASME Y14.5 (cited, not reproduced); ISO 1101 |

## How Angularity Behaves

Angularity belongs to the orientation controls group. Control the angle of a feature relative to a datum, but not its distance.

## Other Orientation controls Controls

The controls in the same category — the ones a drawing is choosing between when it specifies angularity.

| Control | Symbol | Tolerance zone or effect | Datum |
| --- | --- | --- | --- |
| [Perpendicularity](https://shopmath.org/gdt/perpendicularity.md) | ⟂ | Two parallel planes (or a cylinder, for an axis) normal to the datum | always references at least one datum |
| [Parallelism](https://shopmath.org/gdt/parallelism.md) | ∥ | Two parallel planes (or a cylinder, for an axis) parallel to the datum | always references at least one datum |

## Sources and Method for Angularity

### Angularity definition

- **Source**: 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.
- **Method**: compiled
- **Verified against**: Unicode Character Database codepoint check; 98/98 structural checks passed

### Assumptions

- Descriptions are original prose. No ASME Y14.5 definitional text, worked example or figure is reproduced — the standard is cited, not copied.
- Symbol glyphs and codepoints are from the Unicode Character Database; a drawing may render the same characteristic with a different font.
- 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

## 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 GD&T symbol for angularity?

Angularity uses the ∠ symbol — Unicode U+2220. It sits in the first compartment of the feature control frame.

### Does Angularity need a datum?

Angularity always references at least one datum. Without a datum reference frame the control has no origin to measure from.

### What is the tolerance zone for Angularity in GD&T?

The angularity tolerance zone is: Two parallel planes (or a cylinder, for an axis) at the basic angle.

## Related pages

- Previous control: [Profile of a Surface](https://shopmath.org/gdt/profile-of-a-surface.md) (⌓)
- Next control: [Perpendicularity](https://shopmath.org/gdt/perpendicularity.md) (⟂)
- All symbols: [GD&T symbol reference](https://shopmath.org/gdt.md)
- Tolerances: [ISO 286 fit reference](https://shopmath.org/fits.md)

---

*Source: [ShopMath](https://shopmath.org/gdt/angularity) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*