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 "Hepta" never received official sanction and is obsolete.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 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 but and are more open in closed syllables such as in ('to plait') and ('to cook soup'). and tend to be fronted to when following palatalized consonants. Diphthongs, which have the same length as long vowels, consist of a non-high vowel and a high vowel: Tera is a tonal language, distinguishing high,