omega (Greek letter)
Refers to the last letter of the Greek alphabet, often used symbolically for the end or ultimate.
The last letter of the Greek alphabet is omega.
Metaphorical use derived from omega as the last letter; often appears in phrases like アルファでありオメガである (the alpha and the omega). Usually written in kana.
He is the alpha and the omega.
ohm (unit of electrical resistance)
Only when written Ω
Physics term; restricted to the capital form Ω. Cross-referenced with オーム.
See also: オーム
This resistor is 10 ohms.
angular velocity
Only when written ω
Physics term; restricted to the lowercase form ω. Cross-referenced with 角速度.
See also: 角速度
Angular velocity is usually represented by ω.
アルファ is the first letter of the Greek alphabet and symbolizes the beginning, while オメガ is the last letter and symbolizes the end.
Standard Greek capital letter form; used for the letter itself and the ohm unit.
Lowercase form; used for angular velocity and sometimes for the letter itself.
From Greek Ω/ω (omega). The metaphorical 'end' sense comes from omega being the last letter of the Greek alphabet. The physics senses are derived from the symbol's use in scientific notation.