Icon & Symbol Guide

1. UI Icons

Icon	Meaning
	Image Chart — Open a printable chord chart image
	Copy URL — Copy the current page URL to clipboard
◀ ▶	Key Step — Move the key up or down one semitone. Tap ◀ for down, ▶ for up.
	Random Key — Jump to a random transposition
	QR Code — Show a QR code for the current page URL to scan with a smartphone
	Favorite — Save/remove this item from your favorites
	Reverse Search — Find chords by selecting notes on a piano
	Song List (Title order)
	Song List (By composer)
	Share on X (Twitter)
	Share on LINE
	Home — Return to the top page
	Back to top of page

2. Chord Symbol Guide

Chord names are written as Root + Type (e.g., Cm7 = C + minor 7th). Below are common chord type suffixes and their meanings.

Symbol	Full name	Tones (from root)
（なし）	Major triad	1, 3, 5
m	Minor triad	1, ♭3, 5
7	Dominant 7th	1, 3, 5, ♭7
maj7	Major 7th	1, 3, 5, 7
m7	Minor 7th	1, ♭3, 5, ♭7
m7♭5	Half-diminished (ø)	1, ♭3, ♭5, ♭7
dim7	Diminished 7th	1, ♭3, ♭5, ♭♭7
aug	Augmented	1, 3, ♯5
sus4	Suspended 4th	1, 4, 5
9	Dominant 9th	1, 3, 5, ♭7, 9
mMaj7	Minor-major 7th	1, ♭3, 5, 7
add9	Added 9th (no 7th)	1, 3, 5, 9

3. Music Notation Symbols