This is a downloadable font that includes a set of Elkonin-style boxes / one box for each upper and lower case letter of the alphabet.
View and print the preview to see what letters on your keyboard correspond to the dominoes.
This file is a true-type font. Download, unzip, extract the files (very important), right click, and install.
You may not resell this font.
You may use it in printable products to sell.
Please credit Kat and Squirrel as creating the font.