It is traditionally written in vertical lines Top-Down, right across the page, although the Unicode code charts cite the characters rotated to horizontal orientation as this is the orientation of glyphs in a font that supports layout in vertical orientation.
The block has dozens of variation sequences defined for standardized variants.
[3] Notes The Mongolian Unicode block contains its own variation selectors (listed as format controls) for use with the traditional Mongolian alphabet:[5] Additional variations may be also available for traditional Mongolian script characters according to the context of the character, or by using a zero-width joiner (ZWJ, U+200D) and/or a zero width non-joiner (ZWNJ, U+200C) to select the specific form.
The block also contains a format control named "Mongolian vowel separator" (MVS, U+180E).
The following Unicode-related documents record the purpose and process of defining specific characters in the Mongolian block: