Why Symbols and Emoji Break

You copy a symbol, paste it into your bio, and it shows up as an empty rectangle – ▯ – for some people and not others. Nothing is broken. Here is what is actually happening, and which characters are safe to use.

The empty box means a missing glyph

Every character you copy is a Unicode code point: a number that identifies it. Displaying it requires a font on that device containing a drawing for that number. When the device has the code point but no drawing, you get the box. It is sometimes called “tofu”, which is where the font name Noto – “no more tofu” – comes from.

So whether a symbol works is not about the app. It is about the font on the reader’s device, which is why the same bio looks fine on your phone and broken on someone else’s.

Fancy fonts are not fonts, and they have a real cost

The “fancy font” text you see in bios – 𝓼𝓬𝓻𝓲𝓹𝓽, 𝕕𝕠𝕦𝕓𝕝𝕖 𝕤𝕥𝕣𝕦𝕔𝕜, ᴛɪɴʏ ᴄᴀᴘꜱ – is not formatting. Those are separate Unicode characters, mostly from a block intended for mathematical notation. The letters look like letters but are not letters.

That has consequences worth knowing before you use them:

• Screen readers. A screen reader reading 𝓱𝓮𝓵𝓵𝓸 may announce it character by character as mathematical symbols, or skip it entirely. To a blind or low-vision reader, a fancy-font bio can be unreadable.
• Search. Searching for your name will not match the fancy-font version of it, because the characters are different characters.
• Rendering. These blocks have thinner font coverage than ordinary letters, so they are among the most likely to appear as boxes on older devices.

We publish symbol collections, so this argues against some of our own material. It is still true, and you should decide knowing it. Fancy fonts are fine in a caption for effect. In a bio that carries your name or a link, the accessibility cost is real.

Emoji that show as boxes are usually just new

New emoji are added to Unicode every year, and devices only get the drawings for them through operating-system updates. Someone on an older phone has no glyph for a recently added emoji, so they see a box. Nothing you can do to the text fixes this – only their update does.

Joined emoji fall apart

Emoji such as 👨‍👩‍👧 (family) and 👩‍🚒 (firefighter) are not single characters. They are several emoji welded together with an invisible joiner. Where the joiner is unsupported, the sequence splits into its parts – so 👩‍🚒 becomes 👩🚒, a woman standing next to a fire engine. It looks like a typo. It is a rendering fallback.

What is safe almost everywhere

• Ordinary punctuation, arrows, and geometric shapes: → ★ ● ◆ ✓
• Long-established emoji from the earliest sets: 😊 ❤️ 🔥 ✨
• Simple box-drawing and dividers: ─ │ ┈

Riskier: very new emoji, skin-tone and joined sequences, obscure script blocks, and anything you found described as a “rare” symbol – rare usually means poorly supported.

Test it before you commit

Paste it, save it, then look at your profile on a different device – ideally an older one, and one on the other operating system. That is a thirty-second check that catches nearly everything described on this page.

Found a symbol in our collections that breaks somewhere common? Tell us at [email protected] and we will note it or pull it.