how do I create a "∆" this in list front

Answer 1

find png of the object. and use this in CSS

Exam.

ul li {
list-style-image: url("yourimage");
}

Answer 2

google for ASCII table and you'll find a list with these kind of symbols and a code (similar to a color hex code) behind it.

BTW: this is actually the reason why you should define a doctype in your document, because it says that you use the same "table" (simplified)

Answer 3

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