In an absolute numeration system, counts are represented by symbols that have the same value no matter where they appear. The count represented by the numeral is obtained by adding the value of each symbol that forms the numeral. A symbol for a count of zero is not needed.
Historically, absolute systems were invented BEFORE place value systems were invented. This suggests that, for teaching practice, students be exposed to an absolute system before they learn our base 10 place value system. A place value system is much more difficult to understand (but the numerals are easier to work with).
Many absolute systems have been invented. The Egyptian hieroglyphic system is probably the most well-known absolute numeration system.
Shown below are the first twenty numerals of the Egyptian heiroglyphics numeration system (circa 2000 BCE). Notice that two symbols are used: a vertical line (actually a staff) and a horseshoe (actually a heel mark).