# Delta: Wikis

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# Encyclopedia

Delta commonly refers to:

Delta may also refer to:

## Culture and society

### Education

• DELTA (ELT), a professional qualification in English language teaching
• Delta, a quadra group used in socionics

## Science and technology

### Medicine and biology

• Delta (genus), Old World genus of potter wasps
• Delta (ligand), an activator of the Notch signaling pathway
• DELTA (taxonomy), a data format used in taxonomy for recording descriptions of living things
• Delta wave, the frequency band of brain activity between 1 and 4 hertz

# Travel guide

Up to date as of January 14, 2010

### From Wikitravel

There is more than one place called Delta

### Nigeria

• Delta (Nigeria) is a state in Nigeria.

# 1911 encyclopedia

Up to date as of January 14, 2010

### From LoveToKnow 1911

DELTA (from the shape of the Gr. letter A, delta, originally used of the mouth of the Nile), a tract of land enclosed by the diverging branches of a river's mouth and the seacoast, and traversed by other branches of the stream. This triangular tract is formed from the fine silt brought down in suspension by a muddy river and deposited when the river reaches the sea. When tidal currents are feeble, the delta frequently advances some distance seawards, forming a local prolongation of the coast.

# Wiktionary

Up to date as of January 15, 2010

## German

German Wikipedia has an article on:
Delta

Wikipedia de

### Noun

Delta n.

1. delta (greek letter)

# Simple English

 Common letters Uncommon letters Other letters Αa A Μm Em Βb Be Νn En Gg Ge Οο O Δd De Πp Pe h Ha Жж Zhe Εɛ E Rr Ar Ζz Ze Ss Es Ηe Ee Τt Te Θө Eth Uu U Ιi I Ff Ef Jj Je Ww Wa Κk Ka Χx Xa Ll El ОWоw We Vv Ve Digamma Qoppa San Sampi Stigma Sho Greek alphabet

Delta (uppercase/lowercase Δ δ), is the letter of the Greek alphabet, used to represent the "d" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 4. Letters that came from it include the Roman D and Cyrillic Д.

The upper-case letter Δ can be used as symbol representing "change".

In molecular chemistry the lower case greek letter δ is used to represent a partial charge. This is always less than the unit charge associated with an ion but has no real fixed value.

A river delta is so named because its shape approximates the upper-case letter delta.