25 chord signs
Checked October 2026

Half Diminished Alt Code

Copy ø for a half-diminished chord, or type it with Alt+0248; ° for a diminished chord is Alt+248.

øSmall o with strokeU+00F8Ready to copy

25 chord signs. Tap any value to copy it.

25 chord signs. A character and its name both copy the character. A code copies the code.
Character	Name	Code point	Alt code	Option keys	HTML	LaTeX
	U+00F8. Unicode's full name for it is Latin small letter o with stroke. A letter of Danish and Norwegian, typed for the half-diminished chord sign, which is a small circle with a slash. Alt+0248 on a number pad, Option+O on a U.S. layout, ø in HTML and \o in LaTeX text.
	Made of U+0043, U+00F8 and U+0037. The notes C, E♭, G♭ and B♭: the chord also written Cm7♭5.
	Made of U+0042, U+00F8 and U+0037. The notes B, D, F and A: the seventh chord on the seventh degree of C major.
	U+00B0. The degree sign: a small raised circle, the look of the diminished chord sign. Alt+248 or Alt+0176 on a number pad, Option+Shift+8 on a U.S. layout, ° in HTML and \textdegree in LaTeX text.
	Made of U+0043, U+00B0 and U+0037. The notes C, E♭, G♭ and B double flat: its top note is a semitone lower than that of Cø7.
	U+0394. The Greek capital delta, the sign of a major seventh chord. It is in neither Alt code table. Δ in HTML and \Delta in LaTeX.
	U+002B. The plus sign, on the keyboard: the sign of an augmented chord, as in C+. + in HTML.
	U+2212. The minus sign, sometimes written for a minor chord in place of the letter m. − in HTML and \textminus in LaTeX text. The hyphen on the keyboard is another character, U+002D.
	Made of U+0043 and U+00F8. The short form: the 7 is left off and the chord is the same.
	Made of the letters m and b and the figures 7 and 5. The other name of the half-diminished chord, with a small b standing in for the flat sign of m7♭5.
	Made of U+0043 and U+00B0. The diminished triad: C, E♭ and G♭.
	Made of the letters d, i and m. Chord charts also spell the sign out: Cdim is the triad and Cdim7 the seventh chord.
	U+1D52. A raised small o as one character. Unicode records it as a superscript form of the letter o, the shape the diminished sign takes in print. Added in version 4.0 (2003).
	Made of U+0043, U+0394 and U+0037. The notes C, E, G and B, also written Cmaj7.
	Made of U+0043 and U+002B. The notes C, E and G♯, also written Caug.
	Made of U+0043, U+2212 and U+0037. The notes C, E♭, G and B♭, also written Cm7.
	U+00D8. The capital letter of the pair, not the chord sign. Alt+0216 on a number pad, Option+Shift+O on a U.S. layout, Ø in HTML and \O in LaTeX text.
	U+2205. The empty set of mathematics. ∅ in HTML and \emptyset in LaTeX.
	U+2300. The diameter sign of a technical drawing.
	U+00BA. The masculine ordinal indicator, a raised o. Unicode's note: Spanish. Alt+167 or Alt+0186 on a number pad, Option+0 on a U.S. layout and º in HTML.
	U+25B3. A triangle from the Geometric Shapes block, not the Greek letter. &xutri; in HTML and \bigtriangleup in LaTeX.
	U+2206. Increment, a maths operator that looks like Δ. Option+J on a U.S. layout types this one and not the Greek letter.
	U+107A2. A raised ø as one character: Unicode records it as a superscript form of ø. Added in version 14.0 (2021).
	U+1D1A9. Unicode's slashed degree, listed with the signs of musical analysis in the Musical Symbols block. Added in version 3.1 (2001).
	U+1D1FD. A figure 5 with a stroke, from figured bass notation. Unicode's other name for it: diminished 5th. New in version 18.0 (2026).

Next step é and ñ with their Alt codes

How it works

The half diminished Alt code is Alt+0248, which types ø: the letter that stands in for the chord sign, as in Cø7. Leave the zero off and Alt+248 types °, the circle typed for a diminished chord. Unicode names no character half-diminished.

Read the full guide

Two codes one digit apart

The leading zero picks another table, so 0248 and 248 give different characters. Alt+0176 types ° as well, and on the U.S. layout so does Option+Shift+8.

What each chord sign means

Cø7 is C half-diminished seventh: C, E♭, G♭ and B♭, the chord also written Cm7♭5. C°7, the diminished seventh, takes the top note a semitone lower. Δ marks a major seventh, + an augmented chord and − a minor one.

Bø7 is B, D, F and A: the seventh chord on the seventh degree of C major.
Alt+167 types º, the masculine ordinal of Spanish, which only looks like the degree sign.
Unicode has a raised ø, 𐞢, and a slashed degree, 𝆩. A device with no font for them draws an empty box.

Questions and answers

What is the Alt code for the half diminished symbol?

Alt+0248, typed on the number pad with the leading zero. It gives ø, which chord charts write for the half-diminished chord sign. The sign has no character of its own with an Alt code.

What is the diminished Alt code?

Alt+248 or Alt+0176. Both insert °, the degree sign, the character with the look of the diminished symbol: C° is a diminished triad and C°7 a diminished seventh.

How do I type the half diminished symbol on a keyboard?

On a Windows PC, hold Alt and type 0248 on the number pad. On a Mac with the U.S. layout, press Option+O. A laptop keyboard with no number pad has no keys for an Alt code, so copy ø instead.

Is ø the real half-diminished sign?

It is the usual way to write it. In print the sign is a small raised circle with a slash; ø is a letter of Danish and Norwegian with the same look. Where a chart cannot show it, the chord is spelled m7♭5.

All 25 chord signs

Start here 8

B half-diminished seventh Made of U+0042, U+00F8 and U+0037. The notes B, D, F and A: the seventh chord on the seventh degree of C major.
C diminished seventh Made of U+0043, U+00B0 and U+0037. The notes C, E♭, G♭ and B double flat: its top note is a semitone lower than that of Cø7.
C half-diminished seventh Made of U+0043, U+00F8 and U+0037. The notes C, E♭, G♭ and B♭: the chord also written Cm7♭5.
Degree sign U+00B0. The degree sign: a small raised circle, the look of the diminished chord sign. Alt+248 or Alt+0176 on a number pad, Option+Shift+8 on a U.S. layout, ° in HTML and \textdegree in LaTeX text.
Greek capital letter delta U+0394. The Greek capital delta, the sign of a major seventh chord. It is in neither Alt code table. Δ in HTML and \Delta in LaTeX.
Minus sign U+2212. The minus sign, sometimes written for a minor chord in place of the letter m. − in HTML and \textminus in LaTeX text. The hyphen on the keyboard is another character, U+002D.
Plus sign U+002B. The plus sign, on the keyboard: the sign of an augmented chord, as in C+. + in HTML.
Small o with stroke U+00F8. Unicode's full name for it is Latin small letter o with stroke. A letter of Danish and Norwegian, typed for the half-diminished chord sign, which is a small circle with a slash. Alt+0248 on a number pad, Option+O on a U.S. layout, ø in HTML and \o in LaTeX text.

Show all 25 chord signs (17 more)

Half-diminished 2

C half-diminished Made of U+0043 and U+00F8. The short form: the 7 is left off and the chord is the same.
Minor seven flat five in keyboard letters Made of the letters m and b and the figures 7 and 5. The other name of the half-diminished chord, with a small b standing in for the flat sign of m7♭5.

Diminished 3

C diminished Made of U+0043 and U+00B0. The diminished triad: C, E♭ and G♭.
Dim, the diminished abbreviation Made of the letters d, i and m. Chord charts also spell the sign out: Cdim is the triad and Cdim7 the seventh chord.
Modifier letter small o U+1D52. A raised small o as one character. Unicode records it as a superscript form of the letter o, the shape the diminished sign takes in print. Added in version 4.0 (2003).

Major seventh, augmented, minor 3

C augmented Made of U+0043 and U+002B. The notes C, E and G♯, also written Caug.
C major seventh Made of U+0043, U+0394 and U+0037. The notes C, E, G and B, also written Cmaj7.
C minor seventh Made of U+0043, U+2212 and U+0037. The notes C, E♭, G and B♭, also written Cm7.

Look-alikes 6

Diameter sign U+2300. The diameter sign of a technical drawing.
Empty set U+2205. The empty set of mathematics. ∅ in HTML and \emptyset in LaTeX.
Increment U+2206. Increment, a maths operator that looks like Δ. Option+J on a U.S. layout types this one and not the Greek letter.
Latin capital letter o with stroke U+00D8. The capital letter of the pair, not the chord sign. Alt+0216 on a number pad, Option+Shift+O on a U.S. layout, Ø in HTML and \O in LaTeX text.
Masculine ordinal indicator U+00BA. The masculine ordinal indicator, a raised o. Unicode's note: Spanish. Alt+167 or Alt+0186 on a number pad, Option+0 on a U.S. layout and º in HTML.
White up-pointing triangle U+25B3. A triangle from the Geometric Shapes block, not the Greek letter. &xutri; in HTML and \bigtriangleup in LaTeX.

May be an empty box 3

Modifier letter small o with stroke U+107A2. A raised ø as one character: Unicode records it as a superscript form of ø. Added in version 14.0 (2021).
Musical symbol degree slash U+1D1A9. Unicode's slashed degree, listed with the signs of musical analysis in the Musical Symbols block. Added in version 3.1 (2001).
Musical symbol digit five with low stroke U+1D1FD. A figure 5 with a stroke, from figured bass notation. Unicode's other name for it: diminished 5th. New in version 18.0 (2026).

How this list was compiled: Names, and the code points they belong to, are checked against UnicodeData.txt, version 18.0.0 (https://www.unicode.org/Public/18.0.0/ucd/UnicodeData.txt), and printed in sentence case. Notes that begin Unicode's note, and the other names Unicode gives a character, quote NamesList.txt of the same version (https://www.unicode.org/Public/18.0.0/ucd/NamesList.txt), as do the look-alikes Unicode cross-refers; the version a character was added in is from DerivedAge.txt (https://www.unicode.org/Public/18.0.0/ucd/DerivedAge.txt) and the years are from https://www.unicode.org/history/publicationdates.html. A search of UnicodeData.txt finds no character with DIMINISHED in its name, and NamesList.txt uses the word once, as the other name of U+1D1FD; U+1D1A9 stands under the heading Analytics. Alt codes are from the code page 437 table (https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT) and the code page 1252 table (https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP1252.TXT); a character in neither has no Alt code here. That some apps, rich text editors in particular, read an Alt code from 256 to 65,535 as a Unicode code point: https://en.wikipedia.org/wiki/Alt_code. Option keys are those of the U.S. keyboard layout as CLDR records it (https://github.com/unicode-org/cldr/blob/release-42/keyboards/osx/en-t-k0-osx.xml). HTML entity names are from https://html.spec.whatwg.org/entities.json. LaTeX macros are listed only when LaTeX's own fontdef.dtx or ltoutenc.dtx (https://github.com/latex3/latex2e/tree/develop/base) or the amssymb source (https://ctan.org/pkg/amsfonts) defines them, matched to a code point through unicode-math-table.tex (https://github.com/latex3/unicode-math). Compose sequences are from the X.org en_US.UTF-8 Compose file (https://gitlab.freedesktop.org/xorg/lib/libx11/-/blob/master/nls/en_US.UTF-8/Compose.pre). The half-diminished chord, its other name, its notes on B and its place in C major: https://en.wikipedia.org/wiki/Half-diminished_seventh_chord. Which sign marks which chord, the notes of each chord on C and the spelled-out forms: https://en.wikipedia.org/wiki/Chord_notation. The characters those articles write the signs with (a raised ø, a raised o, a raised plus, the Greek Δ, the minus sign): https://en.wikipedia.org/wiki/Template:Music. All read as wikitext on 2026-10-08 and restated in this site's own words. The Start here group, the made rows and the order are this site's own choice. Licence: own work (facts from the Unicode Character Database, Unicode License v3, and from Wikipedia, CC BY-SA 4.0, restated in this site's own words; aliases and notes marked as Unicode's are quoted from NamesList.txt, Copyright © 1991-2026 Unicode, Inc., https://www.unicode.org/license.txt)