Typography

Dấu chấm lửng

U+2026 HORIZONTAL ELLIPSIS (…). Một ký tự duy nhất thay thế ba dấu chấm, đúng về mặt kiểu chữ và được tính là 1 ký tự thay vì 3.

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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

  1. Omission in quotations: "Four score and seven years ago…our fathers brought forth…a new nation"
  2. Trailing speech or thought: She knew the answer, but still…
  3. Pause or hesitation: "I'm not sure if I should… yes, I'll do it."
  4. Unfinished lists: The package includes apples, oranges, bananas…
  5. 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

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