符号对比
外观相似但含义、码位和用途不同的 Unicode 字符。
Em Dash vs En Dash vs Hyphen
Em dash (—), en dash (–), and hyphen (-) look similar but serve different purposes. Learn when to use each in professional writing.
Curly Quotes vs Straight Quotes
Typographic curly quotes (“” ‘’) vs straight ASCII quotes (" '). Understand the difference for professional typography and web publishing.
Multiplication Sign vs Letter X
The multiplication sign × (U+00D7) vs lowercase x vs uppercase X vs ballot X ✕. Learn which to use in math, UI, and typography.
Minus Sign vs Hyphen
The true minus sign − (U+2212) vs the hyphen-minus - (U+002D). Critical distinction for math rendering, accessibility, and precise typography.
Bullet vs Middle Dot
Bullet • (U+2022) vs middle dot · (U+00B7) vs interpunct ·. These similar-looking dots have different sizes, origins, and appropriate uses.
Ellipsis vs Three Periods
The ellipsis character … (U+2026) vs three consecutive periods (...). When to use each, and why it matters for typography and search engines.
Copyright Sign vs Circled C
Copyright symbol © (U+00A9) vs circled capital C Ⓒ (U+24B8). Only one has legal meaning — learn the difference before publishing.
Micro Sign vs Greek Mu
Micro sign µ (U+00B5) vs Greek lowercase mu μ (U+03BC). These look identical but are different code points — critical for scientific and technical writing.
Degree Sign vs Ring Above
Degree sign ° (U+00B0) vs modifier letter ring above ˚ (U+02DA) vs masculine ordinal º. Three look-alikes with completely different purposes.
Apostrophe vs Right Single Quotation Mark
ASCII apostrophe ' (U+0027) vs right single quotation mark ’ (U+2019). The most common typographic substitution and why it matters for your text.
Not-Equal Sign vs Slash-Equal
Mathematical not-equal sign ≠ (U+2260) vs the two-character programming operator != . When each belongs and how they differ semantically.
Left Arrow vs Less-Than Sign
Left arrow ← (U+2190) vs less-than sign < (U+003C). Visually similar characters with entirely different meanings in math, HTML, and UI design.
Check Mark vs Check Box vs Check Emoji
Check mark ✓ (U+2713) vs ballot box with check ☑ (U+2611) vs ✅ emoji. Three visually similar check symbols with different meanings and rendering behavior.
Space Characters: Regular vs NBSP vs Thin vs Zero-Width
Regular space (U+0020) vs non-breaking space (U+00A0) vs thin space (U+2009) vs zero-width space (U+200B). All invisible, all different.
Precomposed ½ vs Fraction Slash Combo
Precomposed vulgar fraction ½ (U+00BD) vs 1⁄ 2 using fraction slash (U+2044). Two ways to write one-half with different code point counts and use cases.