Ohm Symbol (Ω)

Ohm Symbol uses Ω as the unit symbol for the ohm, the SI unit of electrical resistance. The page is about measurement expressions such as 10 Ω, 220 Ω, 1 kΩ, and 2.2 MΩ. A numerical value, an optional SI prefix, and the electrical context make the unit meaning clear. NIST material identifies Ω as the symbol for the ohm. Unit symbols are written without a plural ending, so 1 Ω and 100 Ω use the same form. Prefix letters are case-sensitive: kΩ means kilohm and MΩ means megohm. The glyph is also Greek capital omega. That shared encoding does not make the two pages duplicates. The Omega Symbol page covers the alphabetic character in Greek text and general variables; this page covers resistance, impedance references where ohms are intended, component specifications, and laboratory measurements. A label or table heading should make the quantity explicit. A resistance value should not be copied as a decorative Ω without the number or explanation that gives it meaning. In diagrams and data tables, define whether the value is resistance, impedance magnitude, or another quantity. Screen-reader text can say “ohms” rather than merely announcing “capital omega.”. The existing Unicode, NIST SI, HTML, and accessibility sources are sufficient for this unit-focused explanation. No claim about unrelated uses of omega is added to increase page length. Examples such as Resistance: 10 Ω, Resistor value: 220 Ω, 1 kΩ = 1000 Ω, Tolerance: 100 Ω ± 5%, and Impedance magnitude: 50 Ω define the operational range of Ohm Symbol. The Ohm Symbol use cases are measurements, specifications, laboratory reports, and technical documentation, not unrelated image, logo, or broad-symbolism queries. Keep Ω upright and case-sensitive as a unit symbol. Attach an SI prefix directly to Ω, as in kΩ or MΩ. For Ohm Symbol, Unicode, W3C/WCAG, WHATWG HTML, and NIST provide the evidence base, while ohm and Greek Capital Letter Omega remain accepted lookup labels.