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A think tank, or policy institute, is a research institute that performs research and advocacy concerning topics such as social policy, political strategy, economics, military, technology, and culture. Most think tanks are non-governmental organizations, but some are semi-autonomous agencies within government or are associated with particular political parties, businesses or the military. Think-tank funding often includes a combination of donations from wealthy individuals and personal contributions, with many also accepting government grants.

Think tanks publish articles, studies or even draft legislation on particular matters of policy or society. This information is then readily used by governments, businesses, media organizations, social movements or other interest groups. Think tanks range from those associated with highly academic or scholarly activities to those that are overtly ideological and pushing for particular policy, with widely differing quality of research among them. Later generations of think tanks have tended to be more ideologically oriented.

Modern think tanks began as a phenomenon in the United States in the 19th and early 20th centuries, with most of the rest being established in other English-speaking countries. Prior to 1945, they tended to focus on the economic issues associated with industrialization and urbanization. During the Cold War, many more American and Western think tanks were established, which often guided governmental Cold War policy. Since 1991, more think tanks have been established in non-Western parts of the world. More than half of all think tanks that exist today were established after 1980.

This article lists global policy institutes according to continental categories and then sub-categories by country within those areas. These listings are not comprehensive, given that more than 7,500 think tanks exist worldwide.

INFO: Full form for TT is Telephone Technician in Governmental category
TT also has other full forms in other categories mentioned below.

INFO: Full form for TT is Tubed Tyre in Governmental category
TT also has other full forms in other categories mentioned below.

Transitron Electronic Corporation was a semiconductor device fabrication company of the United States. It was founded by Leo and David Bakalar incorporated in Wakefield, Massachusetts, in 1952. David Bakalar was the president from 1952 to 1984. In 1986 the company went out of business, failing to keep pace with the rapid advances in technology.

INFO: Full form for TT is Trailer Tow in Governmental category
TT also has other full forms in other categories mentioned below.

INFO: Full form for SPL is Sentence Planning Language in Governmental category
SPL also has other full forms in other categories mentioned below.

Structured Product Labeling (SPL) is a Health Level Seven International (HL7) standard which defines the content of human prescription drug labeling in an XML format. The "drug labeling" includes all published material accompanying a drug, such as the Prescribing Information which contains a great deal of detailed information about the drug. As of Release 4 of the SPL standard, 22,000 FDA informational product inserts have been encoded according to the standard.

SPL documents contain both the content of labeling (all text, tables and figures) for a product along with additional machine readable information (drug listing data elements). Drug listing data elements include information about the product (proprietary and nonproprietary names, ingredients, ingredient strengths, dosage forms, routes of administration, appearance, DEA schedule) and the packaging (package quantity and type).

INFO: Full form for SPL is Speed Power Longevity in Governmental category
SPL also has other full forms in other categories mentioned below.

The Transport Department of the Government of Hong Kong is a department of the civil service responsible for transportation-related policy in Hong Kong. The department is under the Transport and Housing Bureau.

The Transport Department was created on 1 December 1968 as a separate department within the Hong Kong Government. Prior to 1968 it was assigned to the Transport Office under the Colonial Secretary's department.

A tank destroyer, tank hunter, tank killer, or self-propelled anti-tank gun is a type of armoured fighting vehicle, armed with a direct-fire artillery gun or missile launcher, designed specifically to engage and destroy enemy tanks, often with limited operational capacities.

While tanks are designed for front-line combat, combining operational mobility and tactical offensive and defensive capabilities and performing all primary tasks of the armoured troops, the tank destroyer is specifically designed to take on enemy tanks and other armoured fighting vehicles. Many are based on a tracked tank chassis, while others are wheeled.

Since World War II, gun-armed powerful tank destroyers have fallen out of favor as armies have favored multirole main battle tanks. However, lightly armored anti-tank guided missile (ATGM) carriers are commonly used for supplementary long-range anti-tank work. The resurgence of expeditionary warfare in the first two decades of the 21st century has seen the emergence of gun-armed wheeled vehicles, sometimes called protected gun systems, which may bear a superficial resemblance to tank destroyers, but are employed as direct fire support units typically providing support in low-intensity operations such as the wars in Iraq and Afghanistan.