I was looking for a font on android supporting the ⌫ character. Did not find any. You can turn this code into a "font with ⌫"-detector, by measuring the width of the span ⌫ is inside.

findfont.js

$(function() {
var fonts = ["cursive", "monospace", "serif", "sans-serif", "fantasy", "default", "Arial", "Arial Black", "Arial Narrow", "Arial Rounded MT Bold", "Arial Unicode", "Bookman Old Style", "Bradley Hand ITC", "Century", "Century Gothic", "Comic Sans MS", "Courier", "Courier New", "Droid Sans", "Droid Serif", "Droid Sans Mono", "Georgia", "Gentium", "Impact", "King", "Lucida Console", "Lalit", "Modena", "Monotype Corsiva", "Papyrus", "Tahoma", "TeX", "Times", "Times New Roman", "Trebuchet MS", "Verdana", "Verona"];

var $testField = $('<span>&#9003;</span>');

for(var i = 0; i < fonts.length; i++) {
	$clone = $testField.clone();
	$clone.css({
		'font-family': fonts[i]
	});
	$('body').append($clone);
	$('body').append('<span style="font-family: ' + fonts[i] +'">' + fonts[i] + ": " + $clone.width() + '</span>');
	$('body').append('<br>');
}
});