| System | Alias / Prefix | Base | Digit Range | Typical Use |
|---|---|---|---|---|
| Binary | Binary / BIN（0b） | 2 | 0~1 | Low-level computer operations, logic circuits, machine code |
| Octal | Octal / OCT（0o） | 8 | 0~7 | Legacy Unix file permissions, embedded systems |
| Decimal | Decimal / DEC | 10 | 0~9 | Everyday human counting, finance, general arithmetic |
| Hexadecimal | Hexadecimal / HEX（0x） | 16 | 0~9, A~F | Programming, memory addresses, color codes like #FF5733 |
| Base-36 | Base-36 | 36 | 0~9, A~Z | Shortened URLs, unique IDs (e.g., product codes, invite codes) |