My physics teacher in high school would sometimes replace variables with smilies to make a point that the symbol representing the variable is not the thing itse

My physics teacher in high school would sometimes replace variables with smilies to make a point that the symbol representing the variable is not the thing itself and I think it helped some students who had problems solving the exact same equation with different variable names. Of course naming conventions are important and were mostly used, but the smilies always stuck with me for some reason.