The "MIT No Attribution" or "MIT-0" license is a modification to the usual MIT license that removes the requirement for attribution. It is roughly the same as an MIT license consisting of a sandwich of (paragraph, line, paragraph), but it is missing the middle line of the 'sandwich'.

This license has proven useful for code that is intended for developers to use as reference, teaching samples, examples, or templates that other developers may modify for their own purposes.

In many of these cases, the initial developer may not want to impose even the cost of attribution, or the use cases may not be conducive to attribution.

The CC0 and various "do what you want" licenses and various public domain dedications may be less attractive to the initial developer for various reasons (i.e., a license is preferable to a public domain dedication). The MIT license with all the attribution requirement language removed fills this need.

MIT No Attribution
Copyright <YEAR> <COPYRIGHT HOLDER>
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

While researching prior to publishing this repo, we discovered https://romanrm.net/mit-zero, which is an independent prior formulation and publication of the same idea.