アルファ (α) - ギリシャ文字 | ギリシャの記号

Alpha (α) - Greek Letter | Greek Symbols Back to Greek Alphabet View Pronunciations | LaTeX Guide Alpha (Α, α) Α Uppercase Α α Lowercase α Quick Info Pronunciation: AL-fuh English: a Common Use: α-particle in physics Historical Background First letter of the Greek alphabet, derived from Phoenician letter "aleph". The name comes from the Phoenician word for ox, reflecting the letter's origin as a pictograph of an ox head. Scientific Applications Physics Alpha particles Chemistry Alpha carbon Mathematics Angular acceleration Statistics Significance level Common Applications Nuclear Physics Alpha decay Alpha particle energy Range in matter Statistical Testing Hypothesis test Test power Common significance levels Special Applications Organic Chemistry Carbon chain positions Alpha amino acid notation Protein structure Astronomy Brightest star designation Fine structure constant Equatorial coordinates Historical Significance Ancient Mathematics • First letter in Greek numeral system • Used in early geometric proofs • Pythagorean theorem annotations • Euclidean geometry labeling Scientific Evolution • Discovery of alpha particles • Development of quantum theory • Statistical methodology • Chemical nomenclature Modern Applications • Computer science algorithms • Machine learning parameters • Financial risk measures • Engineering specifications Writing Guidelines Uppercase resembles the Latin A, lowercase looks like a cursive a. In handwriting, ensure the lowercase α has a clear loop and tail to distinguish it from the Latin a. Related Symbols Nuclear Physics β Beta (Beta radiation) γ Gamma (Gamma radiation) ν Nu (Neutrino) Statistical Analysis μ Mu (Population mean) σ Sigma (Standard deviation) ρ Rho (Correlation) Symbol Codes Unicode Uppercase (Α) Code: U+0391 Hex: Α Decimal: Α Lowercase (α) Code: U+03B1 Hex: α Decimal: α HTML Entities Uppercase (Α) Entity: Α Lowercase (α) Entity: α LaTeX Uppercase (Α) Command: \Alpha Lowercase (α) Command: \alpha Common Usage Physics Nuclear Physics Represents alpha particles (helium nuclei) Optics Angular acceleration in rotational motion Astronomy Brightest star designation in constellations Chemistry Organic Chemistry Position of first carbon in molecules Stereochemistry Configuration of substituents Protein Structure Alpha helix conformation Mathematics Geometry Angle measurements Statistics Level of significance in hypothesis testing Set Theory First element in ordered sets How to Type Alpha Windows Alt Code Hold Alt Type 224 for α Release Alt Character Map Open Character Map Select Greek Find and copy Alpha Unicode Hold Alt + X Type 03B1 Release Alt + X macOS Option Key Press Option + a for α Character Viewer Press Control + Command + Space Select Greek Click Alpha Linux Compose Key Press Compose + a + a for α Unicode Press Ctrl + Shift + U Type 03B1 Press Enter Frequently Asked Questions What is the difference between Alpha (Α) and Latin A? While they look similar in uppercase form, Alpha and Latin A have different historical origins and uses. Alpha is primarily used in Greek text and scientific notation, while A is used in Latin-based alphabets. Why does lowercase alpha (α) have two different forms? The two forms are the "single-story" α (used in handwriting and most fonts) and the "double-story" ɑ (used in some typographic contexts). Both are acceptable, but the single-story form is more common in mathematical and scientific contexts. How is alpha used in scientific notation? Alpha is commonly used to represent angular acceleration in physics, significance levels in statistics, and specific positions in chemical compounds. In nuclear physics, it represents helium nuclei (alpha particles). Can I use alpha in my own writing? Yes, you can use alpha in academic writing, scientific notation, and mathematical expressions. Just ensure you're following the conventions of your field and using the correct typographic form. Copied to clipboard