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>Missing [i] confirmed.
Hertz?
https://en.wikipedia.org/wiki/Hertz
Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the speeds at which computers and other electronics are driven. The units are often also used as a representation of Energy, via the photon energy equation, with one Hertz equivalent to h joules.
Anonymus Bele regis notarius ("Anonymous Notary of King Bela") or Master P. (fl. late 12th century – early 13th century) was the notary and chronicler of a Hungarian King, probably Béla III. Little is known about him, but his latinized name began with P, as he referred to himself as "P. dictus magister".
https://en.wikipedia.org/wiki/Anonymus_(chronicler)
Gloriossimi Belae Regis Notarius