This page collects Unicode characters that are related to computing. For example, symbols for keyboard key icons, Apple keyboard symbols, symbols for line returns, enter, paragraph, file, window, cursor, etc.
Window logo key, Command key, Meta key ⌘ ❖ ◆ ◇
Alt/Opt key ⌥ ⎇
Control key ‸ ✲ ⎈
Shift key ⇧ ⇪
Menu/App key ▤
Return key ↵ ↩ ⏎
Enter key ⌤ ⎆
Tab key ↹ ⇄ ⇤ ⇥ ↤ ↦ ◁ ▷
Esc key ⎋
Delete, clear ⌫ ⌦ ⌧ ⎚ Insert ⎀
Home/End ↖ ↘ ⇤ ⇥ ⤒ ⤓ ⇱ ⇲
Page Up/Down key ⇞ ⇟ ⎗ ⎘ △ ▽ ▲ ▼
Cut ✂ ✄ Undo, redo ⎌ ↶ ↷ ↺ ↻ Reload, refresh ⟲ ⟳
Eject ⏏
print ⎙, mail ✉, home ⌂,
pause key ⎉ break key ⎊ sleep key ☾
Multimedia keys. stop ◼ play/pause ⏯, prev song ⏮, next song ⏭, fast backward ⏪, fast forward ⏩, fast upward ⏫, fast downward ⏬,
mute 🔇 no sound 🔈 sound down 🔉 sound up 🔊
search, find, magnify. 🔍 🔎
brightness. 🔅 🔆
capslock. A⃣ cap letters, lower case, digits, alphanumerics, for input. 🔠 🔡 🔢 🔣 🔤
Sample Use: Keyboard Shortcut Notations ◇ Emacs's Keybinding Layout ◇ Emacs's Command Frequency
Arrow keys ↑ ↓ ← → ◀ ▶ ▲ ▼ ◁ ▷ △ ▽ ⇦ ⇨ ⇧ ⇩ ⬅ ⬆ ⬇ ➡
More: Arrows in Unicode.
Watch ⌚ Hourglass ⌛ ⧗ ⧖ Cursor ⌖ ▮ ▯ vertical bar ❘ ❙ ❚ I-beam ⌶
keyboard ⌨ tape drive ✇ write/comment ✍ ✎ ✏ ✐ ✑ ✒
buttons 🔲 🔳 🔘
loop, shuffle, repeat 🔀 🔁 🔂 🔃 🔄
battery 🔋 🔌 🔔 🔕
lock & keys ⚿ 🔑 🔏 🔐 🔒 🔓
connection, signal 📶
for many more (⁖ folder, floppy, cd/dvd, mail boxes, in/out box, lock/key, notebook, bookmark, calender, speech bubble, …), see Unicode Office Icons
tab, space, ▷ · ␢ ␣ ␠
paragraph, section. ¶ §
placeholder, replacement: �
ASCII control characters. ␀ ␁ ␂ ␃ ␄ ␅ ␆ ␇ ␈ ␉ ␊ ␋ ␌ ␍ ␎ ␏ ␐ ␑ ␒ ␓ ␔ ␕ ␖ ␗ ␘ ␙ ␚ ␛ ␜ ␝ ␞ ␟ ␡
misc: ␁ ␂ ␁ ␂ ␠ 
Sample usage: Emacs's Key Notations Explained ◇ How to Use and Setup Emacs's whitespace-mode
Misc icons ⌗
checkmarks ✓ ✔ ✗ ✘ ☐ ☑ ☒ 𐄂 ⍻ ❍ ❏ ❐ ❑ ❒
Misc ⌜ ⌝ ⌞ ⌟ ⎔ ⎖ ⎁ ⎂ ⎃ ⎄ ⎅
Electricity ⎓ ⏚ ⏛ ⏦ ⏧ ⎏ ⎐
unsorted ƒ ␥ ␦
bank check symbols. Magnetic ink character recognition. ⑀ ⑁ ⑂ ⑃ ⑄ ⑅ ⑆ ⑇ ⑈ ⑉ ⑊
Here's some am looking for but couldn't find.
It's interesting to note that the web standard org W3C made a proposal for many HTML entities to represent many computer icons. See: Unicode: W3C Proposed Icons {Image, Video, Sound File, Trash, Keyboard, Mouse, …}.