I remember sitting in the hallway of the building with the math department waiting for a class to start and picking up a booklet on a table with a style guide f

I remember sitting in the hallway of the building with the math department waiting for a class to start and picking up a booklet on a table with a style guide for writing mathematics and it specifically advised using words in place of symbols, e.g., preferring “for all x in the integers” over “∀x ∊ ℝ.”