Zetta- Zetta- Zetta is a decimal unit prefix in the metric system denoting a factor of 10 or . The prefix was added as an SI prefix to the International System of Units (SI) in 1991 and has the symbol Z. Zetta is evocative of the Latin numeral , meaning "seven". Therefore it was used to denote the seventh power of 1000. A prefix of the same value, "hepta", was informally introduced a few years before the promulgation of zetta. It was formed from the Greek (), also meaning "seven". "Hepta" never received official sanction and is obsolete. Zeta (), although
Tera language mid and low tone. Tone is not indicated orthographically since no minimal trios exist; minimal pairs can be distinguished by context. The first publication in Tera was "Labar Mbarkandu nu Yohanna Bula Ki", a translation of the Gospel of John, which established an orthographic system. In 2004, this orthographic system was revised. Tera language Tera is a Chadic dialect cluster spoken in north-eastern Nigeria in the north and eastern parts of Gombe State and Borno State. Blench (2006) believes Pidlimdi (Hinna) dialect is a separate language. Vowel length contrasts are neutralized in monosyllabic words with no coda consonants. All vowels