Circled M Emoji

Ⓜ️ is a capital letter M inside a circle. Unicode calls it Circled Latin Capital Letter M, but almost nobody uses it that way. In practice, Ⓜ️ is the international metro sign, the symbol you follow underground in Paris, Moscow, Madrid, Milan, Mexico City, and dozens of other cities. Bloomberg counted at least 77 transit agencies using some version of an M for subway branding, and Ⓜ️ is the emoji shorthand for all of them.

The character predates emoji by two decades. It was encoded in Unicode 1.1 back in 1993 as part of the Enclosed Alphanumerics block, long before anyone thought to standardize 😂. It sat quietly in typography for years, then got pulled into the emoji set with a recommended-for-general-interchange (RGI) status when Unicode adopted its first emoji list in 2015. That origin explains why Ⓜ️ looks more like a signage glyph than a bouncy emoji: it's older than Facebook.

Outside transit, people use it for the letter M, McDonald's jokes (the golden arches are stylistically different but close enough), trademark confusion (Ⓜ️ is not a real trademark symbol, those are ™ and ®), and occasionally as a Mastodon shorthand. It's also regularly confused with 〽️ Part Alternation Mark, a Japanese karaoke cue that looks M-shaped but means something completely different.

Ⓜ️ is mostly functional, not expressive. Travel tweets, Google Maps screenshots, metro memes, and "meet me at the Ⓜ️" style messages dominate. It spikes geographically whenever a city's subway breaks down or introduces a new line. In East Asian social media, where blood-type letter buttons 🅰️🅱️🆎🅾️ have personality-test connotations, Ⓜ️ stays neutral because it's not a blood type. McDonald's fans sometimes use it as a low-effort brand stand-in (〽️ and the actual golden arches aren't available as emoji). Mastodon users occasionally adopt it, but the platform's de facto symbol is the elephant 🐘 or mammoth 🦣, not Ⓜ️.

Before Ⓜ️ was an emoji, it was signage. The modern "M for metro" lineage traces back to Paris in 1900, when Hector Guimard designed the Art Nouveau entrance canopies for the brand-new Métropolitain. Guimard's original "Métropolitain" lettering used a flowing Art Nouveau M that evolved into the cleaner Ⓜ️-in-a-circle that modern Paris Métro signage still uses on station maps. Moscow picked up the red M in 1935 after architect Ivan Taranov designed the Sokolniki station marker. Madrid's Metro, opened in 1919, adopted a red-and-blue diamond inspired by the London Underground roundel and eventually settled into the circled-M family. By the time Bloomberg catalogued 77 different Ms in 2015, the circled M had become the most ubiquitous city-branded typographic symbol on Earth.

Unicode didn't design Ⓜ️ to be a metro sign. The character was added in Unicode 1.1 (1993) as one of 26 circled Latin capitals, intended for scholarly notation and list markers. But when Unicode formalized its emoji recommendations in 2015, Ⓜ️ was the only letter in that block that got RGI emoji status, specifically because the transit use case was so universal. The lowercase ⓜ still sits in Unicode as non-emoji typography.

In most of Europe, Ⓜ️ almost always means metro. In the US, subway systems usually go by their own initials (NYC's MTA uses roundel letters per line, not a citywide M; Washington uses ⓜ-shaped signs but not a bold Ⓜ️ brand), so the emoji reads as more generic "the letter M." In Japan, transit uses different signage entirely (Tokyo Metro's marker is a stylized heart-M called the "M over heart"), but Ⓜ️ still appears in Japanese texting for fast-food or the letter M. In Latin America, Mexico City's orange M and São Paulo's circled M both map cleanly to the emoji. In Russia, the red Ⓜ️ is almost synonymous with the Moscow Metro brand. The emoji travels well because the metro association is close to universal, but the exact shade of meaning shifts by city.

• •Ⓜ️ was added to Unicode 1.1 in 1993, predating the official emoji set by nearly two decades. It's older than Gmail.
• •Bloomberg catalogued 77 transit agencies using some version of an M for their metro logo. Ⓜ️ is the de facto emoji for all of them.
• •Paris Métro's M-in-a-circle lineage traces back to Hector Guimard's 1900 Art Nouveau entrances, some of which still stand as UNESCO-protected designs.
• •The Moscow Metro's iconic red M was designed by architect Ivan Taranov and his wife Nadezhda Bykova in 1935. All 97 submissions to the original public contest were rejected.
• •Mexico City's orange Metro M (1969) is paired with Lance Wyman's pictogram system that gives every station its own icon, partly because many early riders couldn't read.
• •Ⓜ️ is a Unicode "Other Symbol" in category So, not a letter. Screen readers typically announce it as "circled M," not just "M."
• •The lowercase sibling ⓜ (U+24DC) exists in Unicode but never got RGI emoji status. It renders as black-and-white typography on most systems.

• •The Moscow Metro's red Ⓜ️ is so iconic it appears on every station plaque and is the central motif of Studio Art. Lebedev's 2014 logo redesign process, one of the most-analyzed brand refreshes in Russian design.
• •Hector Guimard's Paris Métro entrances are in the Museum of Modern Art's permanent collection and UNESCO's cultural heritage inventories. The lettering is the direct ancestor of the Ⓜ️ that travelers use in emoji captions today.
• •Mexico City's Lance Wyman metro system, with its per-station pictograms and orange M, was designed partly because many 1969 riders couldn't read. It's now on every design-history syllabus.

• •Ⓜ️ is U+24C2 U+FE0FU+24C2 U+FE0F. Without the variation selector FE0F, most platforms render it as black text-style typography instead of the colorful emoji glyph.
• •Common shortcode: :m::m: (Slack, Discord, GitHub).
• •Unicode category: Other Symbol (So), not Letter. Collation and sort functions treat it as a symbol, not as uppercase M.
• •The lowercase sibling U+24DCU+24DC (ⓜ) has no RGI emoji status. Don't expect it to render in color on phone keyboards.

See the full Emoji Developer Tools guide for regex patterns, encoding helpers, and more.