Unicode is locale-dependentfor some operations and for rendering. ||lll|l||||IIII||||llll||UnicodesUTF-8UTF-16UTF-32 Unicode NotionEmogiUnicode EquivalenceHalfwidth and Fullwidth FormsUnicode Zero width spaceUnicode Surrogate The Absolute Minimum Every Software Developer Must Know About Unicode in 2023 (Still No Excuses!)Modern extension to classic 2003 article by Joel Spolskyhttps://tonsky.me/blog/unicodeData sumgglingSmuggling arbitrary data through an emojiWith ZWJ (Zero Width Joiner) sequences you could in theory encode an unlimited amount of data in a single emoji.https://paulbutler.org/2025/smuggling-arbitrary-data-through-an-emoji/