counter for (small) things or pieces; counter for military units; (an) individual; one person; counter for years (of age difference); counter for school-years
one (thing); one piece; one item
individual; one by one; separate; each
another; different; separate; discrete
individual; separate; personal; case-by-case
number of articles; number of items; quantity
counter for packages, luggage, etc.; counter for electrical outlets (of a power strip)