Diameter Sign ⌀


Symbol Meaning

Diameter is a segment (chord) connecting two points on the circle passing through its center. Basically, the diameter indicates the length of this segment. It equals to two radii. In formulas it is represented by the Latin letter “D”. The word itself comes from the Greek “diametros” (diameter).

The diameter sign is a circle crossed out by the above-mentioned segment. For clarity, the ends of the segment go beyond the circle, which is technically wrong. The diameter sign is similar to the “o with stroke” used in some Latin-based alphabets. Besides, the number “zero” is often written with a stroke to distinguish it from the letter “o”.

Usually, the sign of the diameter is used on part drawings. It stands before the number on the dimension line: “⌀ 40 cm”. The diameter can be specified for both cylindrical and conical parts. For example — the cylindrical shaft or conical adapter sleeve.

Diameter symbol alt code

It can also be typed under any keyboard setting by pressing NumLock, holding down the Alt key while typing 0216(for uppercase) or 0248 (for lowercase) on the numeric keypad, provided the system uses code page 1252 as system default.

The symbol “Diameter Sign” is included in the “Miscellaneous technical” subblock of the “Miscellaneous Technical” block and was approved as part of Unicode version 1.1 in 1993.

Text is also available in the following languages: Русский;

Unicode Name Diameter Sign
Unicode Number
CSS Code
Plane 0: Basic Multilingual Plane
Unicode Block Miscellaneous Technical
Unicode Subblock Miscellaneous technical
Unicode Version 1.1 (1993)
Type of paired mirror bracket (bidi) None
Composition Exclusion No
Case change 2300
Simple case change 2300
Grapheme_Base +
scripts Common
Pattern_Syntax +
Encoding hex dec (bytes) dec binary
UTF-8 E2 8C 80 226 140 128 14847104 11100010 10001100 10000000
UTF-16BE 23 00 35 0 8960 00100011 00000000
UTF-16LE 00 23 0 35 35 00000000 00100011
UTF-32BE 00 00 23 00 0 0 35 0 8960 00000000 00000000 00100011 00000000
UTF-32LE 00 23 00 00 0 35 0 0 2293760 00000000 00100011 00000000 00000000

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