Uniblok is an unfinished typeface by James Puckett of Dunwich Type Founders. When set solid it forms a grid. At least it does in some applications depending on how they process vertical metrics.
Uniblok is released under the SIL Open Font License: http://scripts.sil.org/cms/scripts/page.php?item_id=OFL_web
If you dig this then do me a favor and buy some fonts at http://www.dunwichtype.com