О сокращенiи: viz.,

[Versteher]

которое утверждается значащимъ: videlicet.


Но, Pardon, откуда-же Z?

[Toivo]

Viz. is the medieval scribal abbreviation for videlicet; it specifically uses a Tironian abbreviation. It comprises the letters v and i followed by ⁊, the common medieval Latin contraction for et and -et.

По всей видимости, z - суррогатный вариант набора знака ⁊.

[Wulfila]

http://www.etymonline.com/index.php?allowed_in_frame=0&search=viz.&searchmode=none

The -z- is not a letter, but originally a twirl, representing the usual M.L. shorthand symbol for the ending -et.

[Versteher]

видимо-съ..покорнѣйше благодарю

[Toivo]

По всей видимости, z - суррогатный вариант набора знака ⁊.

Tironian notes are still used today, particularly, the Tironian "et", used in Ireland to mean 'and' – also used elsewhere in blackletter texts as late as 1821 – and in the "z" of "viz." (for 'et' in videlicet).

Ну вот.