The last letter of the Greek alphabet (Ω, ω) — and the reason the electrical ‘ohm’ sign for resistance looks exactly the same on screen while being a completely different Unicode character underneath. Click any symbol to copy it instantly.
Omega (Ω uppercase, ω lowercase) is the 24th and final letter of the Greek alphabet — the source of ‘omega’ meaning ‘the end’ (as in the New Testament's ‘Alpha and Omega,’ Revelation 22:13), and the letter behind angular velocity (ω) and solid angle (Ω) in physics. It's also at the center of a genuine Unicode quirk: the electrical symbol for the ohm (resistance) has its own separate codepoint, U+2126 OHM SIGN, which Unicode's own official character list marks as normalizing to — and ‘preferred’ as — plain Greek omega (U+03A9). The two are supposed to be treated as the same character, but often aren't. Real bugs have followed: a documented Pandoc conversion issue handled the two inconsistently, converting one to LaTeX's \Omega while failing outright on the other, and electronics forums regularly discuss the two glyphs rendering slightly differently depending on font and OS.
The Greek letter itself, in both cases.
Renders identically to capital omega above, but is encoded as a separate character — plus the electrical unit named by flipping it upside down.
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The letter behind the ‘sigma male’ meme — and why 🗿 outpastes it.
The same kind of mix-up as ohm vs. omega — identical to Greek mu on screen, a different character underneath.
The first letter of the Greek alphabet — capital Α and lowercase α.
The ≅ that every geometry class uses for congruent shapes — same shape, same size.
The capital Δ that means ‘change in’ across math, physics, and engineering, and the lowercase δ used for infinitesimals and the partial…
The Ω sign for electrical resistance, named after Georg Simon Ohm — the German physicist behind Ohm’s law, V = IR.
The lowercase ψ and capital Ψ.
The lowercase θ that marks an angle in trigonometry, the capital Θ of Big-Theta complexity notation, and the open-loop math variant ϑ.