The greatest barrier to understanding is not lack of knowledge but incorrect knowledge. That's why good names matter. And naming things is hard, which is why it makes sense to comment on variable names in a review.
Or for some, if it contains the value of a column in the db, it must have the same name as the column.
So yeah, instead of "UsualQuantityOrder", you get "UslQtyOrd" or "I_U_Q_O"... And you must maintain the comments to explain what the field is supposed to contain.