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Icon name (OSC 1)
Category: extensions · Baseline: core · Tags: Operating System Commands (OSC), Xterm Extensions · Specification ↗
ESC ] 1 ; Pt BELOSC 1 sets the icon name (without changing the window title). The sequence is
ESC ] 1 ; Pt BEL where Pt is the icon name string. This is the companion to OSC 0 (which sets both icon name and title) and OSC 2 (which sets only the title). Originally used by X11 window managers to label minimized windows, icon name is less commonly used in modern terminals but remains part of the xterm protocol. Some terminals treat OSC 1 identically to OSC 0 or ignore the icon name entirely.How this is testedautomated
Send
Send
\x1b]1;test-icon\x07 and verify the terminal remains responsive (icon name accepted without error).The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.
Analysis2026-04-06
Supported by all 9 tested terminals — universal adoption. Part of the Core TUI baseline.
Supported by 14 of 14 backends (100%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | ✓ yes | ||
| Warp | ✓ yes | ||
| Cursor | ✓ yes | ||
| Terminal.app | ✓ yes |