below the existing vowel point or above the cantillation accent that normally fits below the base letter. Such ambiguous positioning occurs in old books like the Codex Leningradensis (around year 1006) whose text on paper was extremely compacted with minimal spacing between letters. Unicode In Unicode, Meteg and Silluq (when it occurs before punctuation Sof passuk at end of verses) are unified. Unicode also does not distinguish between the different placements of Meteg. And because Meteg has a distinctive combining class, its encoding order relative to other diacritics is not significant (because of canonical equivalence). Consequently, the Meteg may be freely reordered during Unicode normalization when it appears in sequences with other combining diacritics, without affecting its interpretation or rendering. Where the relative placement of Meteg is significant and does not match the standard order of combining classes of Hebrew diacritics (where the Meteg should appear after Hebrew vowel points but before Hebrew cantillation marks in normalized texts), a combining grapheme joiner (CGJ, U+034F) should be added between Meteg and other diacritics before or after it, to fix its rendering placement and intended meaning. In the most frequent use of Meteg, it should follow the vowel mark, but the canonical ordering of combining classes swaps them during standard normalizations: the canonical combining class of Meteg is 22, higher than the canonical combining classes 10 to 20 assigned to Hebrew vowel points; it is also higher than the canonical combining class 21 assigned to the combining Dagesh (or Mapiq) consonant modifier, but this generally causes no problem. In the most frequent cases of use in modern Hebrew, the Meteg should only follow a vowel point and cantillation marks are not used; but in Biblical Hebrew it must sometimes be encoded with an additional CGJ after it before a vowel point, so that it remains interpreted first (and rendered to the right) before the niqqud after it (to the left); Meteg must also be preceded by a CGJ if it must appear after (to the left) a cantillation accent (whose combining class is 220 or more). Additionally, the special placements of meteg with the three hataf vowels (whose canonical combinal classes are between 11 and 13) requires encoding it after the hataf vowel point, separated by a zero-width joiner control (ZWJ, U+200D) for the medial position (between the two parts of the hataf vowel), or by a zero-width non-joiner control (ZWNJ, U+200C)