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⏥

flatness

Flatness

On an engineering drawing, ⏥ is the GD&T flatness symbol: it limits variation in a surface's shape. Its tolerance value sets the allowed deviation; older drawings may show a different mark.

Text symbol
Also called
flatness symbol · GD&T flatness
Search it as
gd&t · gdt · engineering drawing · geometric tolerance · tolerance callout
Shows up in
Anything that takes text · its shape is whatever your font draws

What ⏥ means

It limits variation in the indicated surface's shape. The value in the tolerance callout sets a zone between two parallel planes that must contain the whole surface. A datum is a reference feature; the flatness tolerance does not use one to locate the surface.

Straightness, roundness and cylindricity are also form tolerances. ISO and ASME use GD&T; the modern ASME Y14.5 standard grew from military drawing standards and fully incorporated GD&T in 1982.

It is standardized engineering-drawing notation.

Fonts and fallback systems can alter its outline; interpret older marks by the drawing's governing standard.

What it means when someone sends it to you

2 readings
⏥ with a tolerance value
The value sets the permitted departure from flat.
Tilde-like flatness mark on a 1953 drawing
A historical flatness callout; follow that drawing's governing standard.

Questions people ask

1

Why does ⏥ show as a box on some devices?

Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.

How to type ⏥

Windows (Word)
Alt+XType 23E5, then Alt+X to get ⏥.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “flatness”.
Linux
Ctrl+Shift+UType 23e5, then Enter or Space.
HTML
⏥
CSS
\23E5
Codes and encoding1 code points
HTML decimal
⏥
HTML hex
⏥
CSS content
content: "\23E5";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%8F%A5
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes

A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

Families this belongs to

1

Maths & numbers1,835 symbols

1️⃣📏📐✖️➕➖➗🟰♾️#️⃣*️⃣0️⃣