× vs *: What's the Difference?
Clarifying mathematical notation across our complete math symbols knowledge repository. Formal mathematical typography vs. plain-text programming representation.
🎯 The Crucial Difference
× (U+00D7) is the formal typographical math symbol for scalar multiplication, dimensions (4 × 4 matrix), and vector cross products. * (U+002A) is a typewriter asterisk used in programming languages or convolution operations.
Detailed Comparison Table
| Feature / Property | × (Multiplication Cross) | * (Asterisk / Star Operator) |
|---|---|---|
| Primary Context | Formal math publishing & vector cross product | Programming code, ASCII text, or convolution |
| Vector Meaning | A × B (Vector Cross Product) | f * g (Convolution Integral) |
| Matrix Dimensions | 3 × 3 matrix | Avoid in typography (3*3 looks informal) |
| Unicode | U+00D7 | U+002A |
When to Use × (Multiplication Cross)
6 × 8 = 48u × v = |u||v|sin(θ) n̂1920 × 1080 resolution
When to Use * (Asterisk / Star Operator)
let total = a * b;(f * g)(t) = ∫ f(τ)g(t−τ) dτReference footnote *
Common Pitfall to Avoid
Using ASCII asterisk (*) in published academic documents or confusing vector cross product (×) with convolution (*).
× vs * Frequently Asked Questions
Why should I use × instead of * in math equations and papers?
The multiplication cross (×, U+00D7) is the standard ISO 80000-2 typographical glyph for arithmetic and vector cross products. The asterisk (*, U+002A) is a typewriter punctuation mark used in computer code and convolution integrals.
What does the cross symbol (×) mean in linear algebra and physics?
In vector algebra, A × B represents the vector cross product, producing a perpendicular vector with magnitude |A||B|sin(θ). In arithmetic, it represents scalar multiplication.