Open Special Key Symbol

The Open Special Key symbol is a square because a square is the most basic, unambiguous, unownable shape in common use. That is the entire reason.

Proprietary platforms have claimed the meta key as their own. Apple's ⌘ is a historically specific symbol that, through decades of association, reads as "Apple's key." The Windows logo, a stylized four-pane window, reads as "Microsoft's key." Both are marks that say: this keyboard belongs to our platform.

A plain square says the opposite: this key belongs to no one. It is the most legible possible statement that a modifier key is a shared human-computer interface convention, not a brand asset.

Choosing the simplest possible symbol and formally refusing to own it, even after shipping it on our own hardware, is a deliberate act. The optics are the point. We are not discovering that the square is unownable and then reluctantly accepting it. We are choosing the square because it is unownable, and publishing this document so the choice is on the record.

Any keyboard manufacturer, hardware designer, operating system, desktop environment, firmware author, keycap artisan, input device maker, or individual may use a square-derived symbol as a modifier key legend, icon, or indicator, without permission, without license, without attribution to IronTree Software LLC or any other entity.

IronTree Software LLC uses this symbol on LibreWin and on associated hardware. Our use grants no one else a license because no license is required. The symbol is free.

The Open Special Key symbol is a square, in outline or filled form, with or without rounded corners, used as the identifier for a modifier key on a keyboard or input device, functionally equivalent to what proprietary platforms call the "super key," "meta key," "command key," or "Windows key."

Canonical form: A rounded-corner square in outline, sized proportionally to other key legend symbols.

Unicode anchor: U+25A1 WHITE SQUARE (□), acknowledged as prior art for the base form. Rounded-corner variants (as commonly appear on key legends and hardware) are explicitly included in this dedication.

Scope of the standard: Any square-derived form in which the shape reads as a square rather than a circle is within scope. This includes:

• Outline square, sharp corners
• Outline square, rounded corners (the expected hardware form)
• Filled square, sharp corners
• Filled square, rounded corners
• Variants with moderate corner radii, adjusted stroke weights, or proportional scaling within normal square dimensions

No specific corner radius, fill treatment, stroke weight, aspect ratio within normal square proportions, or size relative to surrounding elements is mandated or excluded. The convention is the square-as-key-symbol, not any one rendering of it.

IronTree Software LLC hereby dedicates the Open Special Key symbol, in all forms described in §3, to the public domain under the Creative Commons CC0 1.0 Universal dedication.

To the extent possible under law, IronTree Software LLC waives all copyright and related or neighboring rights to any original creative expression in the symbol and its documented renderings. This dedication covers all jurisdictions worldwide.

The symbol and all renderings documented here may be used, copied, modified, manufactured, distributed, and incorporated into any product, hardware or software, for any purpose, without permission, attribution, or license fee.

IronTree Software LLC covenants, for itself and its successors and assigns, that it will never assert any trademark, trade dress, service mark, certification mark, or any other intellectual property right over:

• the plain square symbol used as a keyboard modifier key indicator,
• any rounded-corner variant of that symbol used in the same context,
• any hardware keycap, software key icon, or input device legend depicting a square-derived form as described in §3,

regardless of how much secondary meaning IronTree Software LLC may acquire in the symbol through use of LibreWin, associated hardware, or related products.

This covenant is irrevocable. It is made publicly and in perpetuity. Any rights IronTree Software LLC acquires in this symbol through use are hereby prospectively waived.

The plain square as a typographic and symbolic element is universal prior art with centuries of documented use. As a keyboard key symbol specifically:

• Square and rounded-square key legend symbols appear throughout keyboard hardware history as generic, unbranded design elements.
• U+25A1 (WHITE SQUARE) and U+25A0 (BLACK SQUARE) have been encoded in Unicode since Unicode 1.1 (1993) and appear in virtually every font and rendering environment.
• Rounded-corner square forms appear throughout UI design systems, icon standards, and hardware key legends as generic geometric elements with no established trademark owner.

No entity holds or has held a valid trademark over a plain square used as a keyboard key symbol. This dedication confirms and extends that status.