省略記号
U+2026 水平省略記号（…）。3つのピリオドの代わりに使う単一の文字で、タイポグラフィ的に正しく、3文字ではなく1文字として数えられます。
What is an Ellipsis?
The ellipsis is a punctuation mark consisting of three evenly-spaced dots that indicates an omission, a trailing off, a pause, or suspended thought. Unicode encodes a dedicated ellipsis character (U+2026, …) as a single code point, distinct from simply typing three consecutive periods (...). The difference matters more than most people realize.
The Single Character vs. Three Periods
The ellipsis character U+2026 (…) and three periods (...) look nearly identical on screen but behave very differently:
| Property | Ellipsis U+2026 | Three Periods ... |
|---|---|---|
| Code points | 1 | 3 |
| Line breaking | Stays together | Can break after any period |
| Spacing | Designed by font (often tighter) | Standard period spacing |
| Word count | 1 token | 3 tokens |
| Search matching | May not match ... |
Won't match … |
| Screen reader | "ellipsis" | "period period period" |
From a typographic standpoint, the dedicated ellipsis character is preferable in body text because its spacing is optimized by the font designer. In programming and markup contexts, three periods are often more predictable.
Semantic Uses of the Ellipsis
- Omission in quotations: "Four score and seven years ago…our fathers brought forth…a new nation"
- Trailing speech or thought: She knew the answer, but still…
- Pause or hesitation: "I'm not sure if I should… yes, I'll do it."
- Unfinished lists: The package includes apples, oranges, bananas…
- Code/UI: Loading…, File menu truncation "Open Recen…"
Ellipsis in User Interfaces
In UI design, the ellipsis has a specific convention: a menu item followed by an ellipsis (e.g., "Save As…") indicates that clicking it will open a dialog requiring further input before the action is taken. A menu item without an ellipsis (e.g., "Save") acts immediately. This convention comes from Apple's original Macintosh Human Interface Guidelines.
In modern apps, a three-dot "more options" button (⋯ U+22EF or ··· three bullets) is sometimes called an "ellipsis menu" colloquially, though it is technically a different symbol.
Ellipsis Variants
| Character | Unicode | Name | Use |
|---|---|---|---|
| … | U+2026 | Horizontal Ellipsis | Standard |
| ⋯ | U+22EF | Midline Horizontal Ellipsis | Mathematics |
| ⋮ | U+22EE | Vertical Ellipsis | Mathematics |
| ⋱ | U+22F1 | Down Right Diagonal Ellipsis | Matrix notation |
| ︙ | U+FE19 | Presentation Form Vertical Ellipsis | CJK presentation |
Typing the Ellipsis
- macOS: Option + ; (semicolon)
- Windows: Alt + 0133 (numpad), or the Character Map
- HTML:
…or… - CSS content:
content: "\2026" - Python:
"\u2026"or the literal…
Quick Facts
| Property | Value |
|---|---|
| Unicode code point | U+2026 |
| Unicode name | HORIZONTAL ELLIPSIS |
| Character block | General Punctuation |
| macOS shortcut | Option + ; |
| HTML entity | … |
| UI convention | Ellipsis in menu item = dialog will follow |
| Three periods alternative | ... (U+002E × 3) — fine for code, less ideal for body text |
タイポグラフィ のその他の用語
CSS @font-face descriptor specifying which Unicode code points a font should cover. …
Em：フォントサイズと等しい幅。En：Emの半分。エムダッシュ幅・エムスペース・エンスペース・CSSユニット（1em・0.5em）の定義に使われます。
The mechanism by which a rendering engine substitutes glyphs from a secondary …
Modern font format developed by Microsoft and Adobe supporting up to 65,535 …
文字が右から左に流れるテキスト方向。アラビア語・ヘブライ語・ターナ文字などで使われ、正しい表示のために双方向アルゴリズムが必要です。
Fonts downloaded by the browser to render text, declared via CSS @font-face. …
視覚的な調和のために特定の文字ペア（例：AV・To・LT）間のスペーシングを調整すること。Unicodeの概念ではなくフォント機能ですが、Unicodeテキストのレンダリングに影響します。
フォントによってレンダリングされる文字の視覚的表現。1つの文字が複数のグリフを持つ場合があり（合字・文脈形態）、1つのグリフが複数の文字を表す場合もあります。
小文字の高さの大文字字形。CSS：font-variant: small-caps。Unicodeにはラテン拡張（ᴀ〜ᴢ）に実際のスモールキャップス文字があります。
前進幅がゼロの文字 — レンダリングでは見えませんがテキスト動作に影響します。ZWSP（単語区切り）・ZWJ（結合）・ZWNJ（結合防止）・WJ（改行防止）などがあります。