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Hex input of Unicode must be enabled. In Mac OS 8.5 and later, one can choose the Unicode Hex Input keyboard layout; in OS X (10.10) Yosemite, this can be added in Keyboard → Input Sources. Holding down ⌥ Option, one types the four-digit hexadecimal Unicode code point and the equivalent character appears; one can then release the ⌥ Option ...
Enable the Input menu (via the 'Input Sources' panel of the 'Keyboard' System Preferences). This gives access to: the Keyboard Viewer, which can be used to view and input characters accessed via the ⌥ Option key; the Character Viewer, which can be used to access any Unicode character. It is also available from the Special Characters tool
To enable it, a user must set or create a string type (REG_SZ) value called EnableHexNumpad in the registry key HKEY_CURRENT_USER\Control Panel\Input Method, assign the value data 1 to it, and then reboot or log out/in. A leading + then indicates hex input, for example Alt++ 11B will produce ě (e with caron).
Users can also create these symbols by switching the keyboard to Unicode, holding ⌥ Option and typing the Unicode hex input. For example, holding down ⌥ Option+2+6+3+A would create ☺. The desktop OS uses the Apple Color Emoji font that was introduced earlier in iOS. This provides users with full color pictographs.
In many Unicode fonts, only the subset that is also available in the IBM PC character set (see below) will exist, due to it being defined as part of the WGL4 character set. Box Drawing [1] Official Unicode Consortium code chart (PDF)
For Mac (or iOS with an external keyboard) use: ⌥ Opt+-(en dash) or ⌥ Opt+⇧ Shift+-(em dash). Alternatively for Mac: Pull down the Input menu and select Show Emoji & Symbols. Then select from Punctuation. If the Input menu is not displayed, open Language & Region within System Preferences.
The Universal Coded Character Set (UCS, Unicode) is a standard set of characters defined by the international standard ISO/IEC 10646, Information technology — Universal Coded Character Set (UCS) (plus amendments to that standard), which is the basis of many character encodings, improving as characters from previously unrepresented writing systems are added.
A six-bit character code is a character encoding designed for use on computers with word lengths a multiple of 6. Six bits can only encode 64 distinct characters, so these codes generally include only the upper-case letters, the numerals, some punctuation characters, and sometimes control characters.