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# Unicode Symbols Reference for CLI Design
This reference provides CLI-safe Unicode symbols with platform compatibility notes and usage recommendations.
## Status Indicators
### Success/Completion
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ✓ | U+2713 | Check Mark | ✓ | ✓ | ✓ | Universal, highly recommended |
| ✔ | U+2714 | Heavy Check | ✓ | ✓ | ✓ | Bolder variant |
| ✅ | U+2705 | Check Button| ✓ | ✓ | Windows 10+ | Emoji, may render large |
| ◉ | U+25C9 | Fisheye | ✓ | ✓ | ✓ | Alternative indicator |
| ● | U+25CF | Black Circle| ✓ | ✓ | ✓ | Simple, safe |
### Failure/Error
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ✗ | U+2717 | Ballot X | ✓ | ✓ | ✓ | Universal, highly recommended |
| ✘ | U+2718 | Heavy Ballot X | ✓ | ✓ | ✓ | Bolder variant |
| ❌ | U+274C | Cross Mark | ✓ | ✓ | Windows 10+ | Emoji, may render large |
| ⨯ | U+2A2F | Vector Cross| ✓ | ✓ | Limited | Mathematical, less support |
| × | U+00D7 | Multiplication | ✓ | ✓ | ✓ | Very safe fallback |
### Warning/Alert
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ! | U+0021 | Exclamation | ✓ | ✓ | ✓ | ASCII, universal |
| ⚠ | U+26A0 | Warning Sign| ✓ | ✓ | ✓ | Good support |
| ⚠️ | U+26A0 U+FE0F | Warning (Emoji) | ✓ | ✓ | Windows 10+ | May render colorful |
| ⚡ | U+26A1 | High Voltage| ✓ | ✓ | ✓ | Alternative attention |
| ⓘ | U+24D8 | Info Circle | ✓ | ✓ | Limited | Less common |
### Neutral/In Progress
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| - | U+002D | Hyphen | ✓ | ✓ | ✓ | ASCII, universal |
| • | U+2022 | Bullet | ✓ | ✓ | ✓ | Good for lists |
| ○ | U+25CB | White Circle| ✓ | ✓ | ✓ | Hollow indicator |
| ◦ | U+25E6 | Small Circle| ✓ | ✓ | ✓ | Smaller variant |
| ⋯ | U+22EF | Midline Ellipsis | ✓ | ✓ | ✓ | Indicates processing |
## Directional Arrows
### Basic Arrows
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| → | U+2192 | Rightwards | ✓ | ✓ | ✓ | Universal, highly recommended |
| ← | U+2190 | Leftwards | ✓ | ✓ | ✓ | Universal |
| ↑ | U+2191 | Upwards | ✓ | ✓ | ✓ | Universal |
| ↓ | U+2193 | Downwards | ✓ | ✓ | ✓ | Universal |
| ↔ | U+2194 | Left-Right | ✓ | ✓ | ✓ | Bidirectional |
| ⇄ | U+21C4 | Right-Left | ✓ | ✓ | ✓ | Over arrows |
### Special Arrows
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ➜ | U+279C | Heavy Arrow | ✓ | ✓ | Limited | Prompt indicator |
| ⟹ | U+27F9 | Long Right | ✓ | ✓ | Limited | Implications |
| ↩ | U+21A9 | Left Hook | ✓ | ✓ | ✓ | Return, undo |
| ↪ | U+21AA | Right Hook | ✓ | ✓ | ✓ | Forward, redo |
| ⤴ | U+2934 | Up-Right | ✓ | ✓ | Limited | External link |
| ⤵ | U+2935 | Down-Right | ✓ | ✓ | Limited | Nested content |
## Tree/Hierarchy Symbols
### Box Drawing Characters
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| │ | U+2502 | Vertical | ✓ | ✓ | ✓ | Tree lines |
| ─ | U+2500 | Horizontal | ✓ | ✓ | ✓ | Tree branches |
| ├ | U+251C | Middle Node | ✓ | ✓ | ✓ | Tree connector |
| └ | U+2514 | Last Node | ✓ | ✓ | ✓ | Tree terminal |
| ┌ | U+250C | Top-Left | ✓ | ✓ | ✓ | Box corners |
| ┐ | U+2510 | Top-Right | ✓ | ✓ | ✓ | Box corners |
| ┘ | U+2518 | Bottom-Right| ✓ | ✓ | ✓ | Box corners |
| ┤ | U+2524 | Right T | ✓ | ✓ | ✓ | Box connectors |
| ┬ | U+252C | Top T | ✓ | ✓ | ✓ | Box connectors |
### Tree Connectors (Heavy)
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ┃ | U+2503 | Heavy Vertical | ✓ | ✓ | ✓ | Emphasis |
| ━ | U+2501 | Heavy Horizontal | ✓ | ✓ | ✓ | Emphasis |
| ┣ | U+2523 | Heavy Middle | ✓ | ✓ | ✓ | Emphasis |
| ┗ | U+2517 | Heavy Last | ✓ | ✓ | ✓ | Emphasis |
## List Markers
### Bullets
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| • | U+2022 | Bullet | ✓ | ✓ | ✓ | Standard list |
| ◦ | U+25E6 | White Bullet| ✓ | ✓ | ✓ | Nested lists |
| ▪ | U+25AA | Black Square| ✓ | ✓ | ✓ | Alternative |
| ▸ | U+25B8 | Right Tri | ✓ | ✓ | ✓ | Collapsible |
| ▾ | U+25BE | Down Tri | ✓ | ✓ | ✓ | Expanded |
| ‣ | U+2023 | Triangular | ✓ | ✓ | ✓ | Alternative |
### Numbered Alternatives
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ①②③ | U+2460+ | Circled Digits | ✓ | ✓ | ✓ | 1-20 available |
| ⑴⑵⑶ | U+2474+ | Parenthesized | ✓ | ✓ | ✓ | 1-20 available |
| ➀➁➂ | U+2780+ | Sans-Serif | ✓ | ✓ | Limited | Less support |
## Shapes & Indicators
### Geometric Shapes
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ■ | U+25A0 | Black Square| ✓ | ✓ | ✓ | Filled indicator |
| □ | U+25A1 | White Square| ✓ | ✓ | ✓ | Hollow indicator |
| ▪ | U+25AA | Small Square| ✓ | ✓ | ✓ | Compact |
| ▫ | U+25AB | Small White | ✓ | ✓ | ✓ | Compact hollow |
| ▲ | U+25B2 | Black Triangle | ✓ | ✓ | ✓ | Up indicator |
| △ | U+25B3 | White Triangle | ✓ | ✓ | ✓ | Up hollow |
| ▼ | U+25BC | Down Triangle | ✓ | ✓ | ✓ | Down indicator |
| ▽ | U+25BD | Down White | ✓ | ✓ | ✓ | Down hollow |
### Progress Indicators
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ░ | U+2591 | Light Shade | ✓ | ✓ | ✓ | Progress bar empty |
| ▒ | U+2592 | Medium Shade| ✓ | ✓ | ✓ | Progress bar partial |
| ▓ | U+2593 | Dark Shade | ✓ | ✓ | ✓ | Progress bar almost |
| █ | U+2588 | Full Block | ✓ | ✓ | ✓ | Progress bar filled |
| ▌ | U+258C | Left Half | ✓ | ✓ | ✓ | Partial progress |
| ▐ | U+2590 | Right Half | ✓ | ✓ | ✓ | Partial progress |
## Spinners & Animations
### Rotating Indicators
| Sequence | Unicode | Description | Notes |
|----------|---------|-------------|-------|
| ⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏ | U+280B+ | Braille Dots | Smooth spinner |
| ◐◓◑◒ | U+25D0-U+25D2 | Circles | Simple rotation |
| ◴◷◶◵ | U+25F4-U+25F7 | Quadrants | Rotating |
| ⣾⣽⣻⢿⡿⣟⣯⣷ | U+28BE+ | Braille Heavy | Heavy spinner |
| ▁▂▃▄▅▆▇█▇▆▅▄▃▂ | U+2581+ | Bars | Growing/shrinking |
### Discrete States
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ◜◝◞◟ | U+25DC+ | Quarter Circles | ✓ | ✓ | Limited | 4-state indicator |
| ▖▘▝▗ | U+2596+ | Quarter Blocks | ✓ | ✓ | ✓ | 4-state |
## Special Purpose
### Git/Version Control
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| + | U+002B | Addition | ✓ | ✓ | ✓ | ASCII, additions |
| - | U+002D | Deletion | ✓ | ✓ | ✓ | ASCII, deletions |
| ± | U+00B1 | Plus-Minus | ✓ | ✓ | ✓ | Changes |
| ≠ | U+2260 | Not Equal | ✓ | ✓ | ✓ | Conflicts |
| ∼ | U+223C | Tilde | ✓ | ✓ | ✓ | Modified |
| ⎇ | U+2387 | Alternative | ✓ | ✓ | Limited | Branch symbol |
### File Operations
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| 📁 | U+1F4C1 | Folder | ✓ | ✓ | Windows 10+ | Emoji |
| 📄 | U+1F4C4 | Document | ✓ | ✓ | Windows 10+ | Emoji |
| 🔗 | U+1F517 | Link | ✓ | ✓ | Windows 10+ | Emoji |
| 🗑 | U+1F5D1 | Trash | ✓ | ✓ | Windows 10+ | Emoji |
| ∅ | U+2205 | Empty Set | ✓ | ✓ | ✓ | No files |
### Time & Duration
| Symbol | Unicode | Description | macOS | Linux | Windows | Notes |
|--------|---------|-------------|-------|-------|---------|-------|
| ⏱ | U+23F1 | Stopwatch | ✓ | ✓ | Limited | Timing |
| ⌛ | U+231B | Hourglass | ✓ | ✓ | ✓ | Waiting |
| ⏳ | U+23F3 | Flowing Sand| ✓ | ✓ | Limited | Processing |
| 🕐 | U+1F550 | Clock | ✓ | ✓ | Windows 10+ | Emoji |
## Platform Compatibility Guide
### Universal (Safe Everywhere)
These work reliably across all platforms:
- ASCII characters (`!`, `-`, `+`, `*`, `|`)
- Basic arrows (`→`, `←`, `↑`, `↓`)
- Check/X marks (`✓`, `✗`)
- Box drawing (`│`, `─`, `├`, `└`)
- Basic bullets (`•`, `○`)
- Basic shapes (`■`, `□`, `▲`, `▼`)
### Good Support (Modern Terminals)
Works on macOS, Linux, and Windows 10+:
- Warning symbols (`⚠`)
- Extended arrows (`➜`, `↩`, `↪`)
- Progress blocks (`░`, `▒`, `▓`, `█`)
- Braille spinners (`⠋`, `⠙`, `⠹`, etc.)
### Limited Support (Use with Caution)
May not render on older systems or all terminals:
- Emoji (`✅`, `❌`, `📁`, `📄`, `🕐`)
- Specialized math symbols (`⟹`, `⨯`)
- Advanced geometric shapes (`◴`, `◷`, `◜`, `◝`)
### Windows Considerations
- Windows 10+ has much better Unicode support than earlier versions
- Windows Terminal supports more symbols than legacy cmd.exe
- PowerShell 7+ has improved rendering
- Consider providing `-UseAscii` flag for older systems
## Usage Recommendations
### 1. Semantic Consistency
Use the same symbol for the same meaning throughout your CLI:
```
✓ Operation completed successfully
✗ Operation failed
⚠ Warning: destructive action
→ Navigate to next step
```
### 2. Provide ASCII Fallbacks
For critical information, offer ASCII alternatives:
```bash
if supports_unicode; then
echo "✓ Success"
else
echo "[OK] Success"
fi
```
### 3. Test Rendering
Always test symbols in:
- macOS Terminal
- iTerm2
- Windows Terminal
- PowerShell
- VS Code integrated terminal
- Linux GNOME Terminal
### 4. Avoid Emoji in Production CLIs
Emoji can:
- Render at different sizes
- Display in color (disrupting design)
- Fail on older systems
- Be inconsistent across fonts
Use simple Unicode symbols instead.
### 5. Consider Accessibility
- Screen readers handle ASCII better than Unicode
- Provide text alternatives
- Don't rely solely on symbols for meaning
## Quick Reference: Common Patterns
### Status Line
```
✓ Task completed
✗ Task failed
⚠ Task needs attention
- Task pending
```
### File Tree
```
project/
├── src/
│ ├── main.rs
│ └── lib.rs
├── tests/
│ └── test.rs
└── Cargo.toml
```
### Progress Bar
```
[████████░░] 80%
[▓▓▓▓▓▓▓▓▒▒] 8/10 complete
```
### List Navigation
```
→ Selected item
Other item
Another item
```
### Spinner States
```
⠋ Loading...
⠙ Loading...
⠹ Loading...
⠸ Loading...
```
## Testing Utilities
### Environment Detection
```bash
# Check Unicode support
locale | grep -i utf
# Check terminal capabilities
echo $TERM
# Test symbol rendering
echo "✓ ✗ ⚠ → ├ ▓"
```
### Manual Test String
Copy this string to test symbol support:
```
✓✗⚠!•→←↑↓│─├└■□▲▼░▒▓█⠋⠙⠹⠸
```
## Additional Resources
- Unicode Character Database: https://unicode.org/charts/
- Terminal compatibility: https://github.com/sindresorhus/figures
- Box drawing: https://en.wikipedia.org/wiki/Box-drawing_character
- Braille patterns: https://en.wikipedia.org/wiki/Braille_Patterns