Unicode characters

I've noticed toAlgo ports come with some unicode characters, the code window its self even shows the symbols and they can be copy-pasted. Given there are no fonts, I can't just use windings or what not. What characters does the platform support and where can I get a list of codes to paste in?

public static string GetArrowByCode(int code)
{
    switch (code) 
	{
		case 0:
			return string.Empty;
        case 32:
            return " ";
        case 33:
            return "✏";
        case 34:
            return "✂";
        case 35:
            return "✁";
        case 40:
            return "☎";
        case 41:
            return "✆";
        case 42:
            return "✉";
        case 54:
            return "⌛";
        case 55:
            return "⌨";
        case 62:
            return "✇";
        case 63:
            return "✍";
        case 65:
            return "✌";
... etc