At its simplest:
figlet "Text"
figlet -f small "Small Text" ___ _ _ _____ _ / __|_ __ __ _| | | |_ _|____ _| |_ \__ \ ' \/ _` | | | | |/ -_) \ / _| |___/_|_|_\__,_|_|_| |_|\___/_\_\\__|
At its simplest:
or use fonts