Editing Positional notation (section)

== Non-positional positions ==
Each position does not need to be positional itself. [[Babylonian cuneiform numerals|Babylonian sexagesimal numerals]] were positional, but in each position were groups of two kinds of wedges representing ones and tens (a narrow vertical wedge | for the one and an open left pointing wedge ⟨ for the ten) — up to 5+9=14 symbols per position (i.e. 5 tens ⟨⟨⟨⟨⟨ and 9 ones ||||||||| grouped into one or two near squares containing up to three tiers of symbols, or a place holder (⑊) for the lack of a position).<ref>Ifrah, pages 326, 379</ref> Hellenistic astronomers used one or two alphabetic Greek numerals for each position (one chosen from 5 letters representing 10–50 and/or one chosen from 9 letters representing 1–9, or a [[Greek numerals#Hellenistic zero|zero symbol]]).<ref>Ifrah, pages 261–264</ref>