# Set Icon Name (OSC 1)

> Set the name the window manager shows for the terminal's window when it is iconified.

- **Sequence:** `OSC 1 ; Pt ST`
- **ECMA-48:** [§8.3.89 OSC – Operating System Command, p. 51](https://archive.org/details/ecma-48-5th-edition-june-1991/page/n64/mode/1up)
- **xterm:** [Operating System Commands](https://invisible-island.net/xterm/ctlseqs/ctlseqs.html)

`OSC 1 ; Pt ST` sets the window's *icon name*, the label a window manager
shows for it when it is iconified, and leaves the title alone. It is
xterm's, from dtterm, beside [OSC 0](https://control-codes.page/osc/icon-and-title/index.html.md), which sets both,
and [OSC 2](https://control-codes.page/osc/title/index.html.md), which sets the title. Sun's and dtterm's older
form of it is `OSC L Pt ST`, with the letter `L` and no `;`.

Unlike `OSC 0` and `OSC 2`, a default xterm keeps only the low seven bits
of each character of an icon name, so anything beyond ASCII comes out
changed ([`doparsing`](https://github.com/ThomasDickey/xterm-snapshots/blob/xterm-411a/charproc.c#L3438-L3456)).
Few desktops show icon names now, and a case cannot see one: what it can
see is that the title does not change.

libghostty-vt has no icon name, and ignores `OSC 1`, which leaves the title
alone as xterm does.

## Validation

### OSC1-1: The title is left alone

Input, one step per line:

```text
\e]2;Window\a
\e]1;Icon\a
```

Expected screen:

```text
|___|
title "Window"
```

### OSC1-2: Nothing on screen

Input, one step per line:

```text
A
\e]1;Icon\e\\
B
```

Expected screen:

```text
|AB_|
cursor 1,3
```

---

This is the Markdown version of <https://control-codes.page/osc/icon/>. On that page every validation case runs live in libghostty-vt, the terminal emulation core of Ghostty, compiled to WebAssembly.

The validation cases are written in the notation described in <https://control-codes.page/notation/index.html.md>.