Taiko

Taiko (太鼓^?) are a broad range of Japanese percussion instruments. In Japanese, the term refers to any kind of drum, but outside Japan, it is used to refer to any of the various Japanese drums called wadaiko (和太鼓, "Japanese drums") and to the form of ensemble taiko drumming more specifically called kumi-daiko (組太鼓, "set of drums"). The process of constructing taiko varies between manufacturers, and preparation of both the drum body and skin can take several years depending on methodology.

Taiko have a mythological origin in Japanese folklore, but historical records suggest that taiko were introduced to Japan through Korean and Chinese cultural influence as early as the 6th century CE. Some taiko are similar to instruments originating from India. Archaeological evidence also supports that taiko were present in Japan during the 6th century in the Kofun period. Their function has varied through history, ranging from communication, military action, theatrical accompaniment, and religious ceremony to both festival and concert performances. In modern times, taiko have also played a central role in social movements for minorities both within and outside Japan.

Group

Group may refer to:

Groups of people

In science and technology

In mathematics

In chemistry

In computing and the internet

Other uses in science and technology

Other uses

Shot grouping

In shooting, a shot grouping, or simply grouping, is the placement of multiple shots on a target, the shots taken in one shooting session. The closeness of the grouping, the nearness of all the shots to each other, is a measure of the accuracy of a weapon, and a measure of the shooter's consistency and skill.

Uses of the term

For firearms that shoot one round at a time, a shot grouping can be used to measure the accuracy of the system comprised out of weapon as well as the precision and uniformity of the ammunition by fixing the weapon into position on a test mount, and aiming it at a target. Multiple shots using rounds from same type and batch are fired to observe how the weapon groups the shots. If a person holds the weapon and shoots it, the grouping measures the combination of the person's skill and the weapon's accuracy.

In shotgun shooting, the grouping is also called the pattern. The pattern is the spread of shot from a single shotgun shell, measured as the smallest circle containing all the shots on the target. The barrel of a shotgun is designed to deliver a wide or narrow grouping, depending on the expected use. Shooting at close range indicates a cylinder bore barrel to deliver a wide grouping, while for hunting at longer distances such as 50 yards or meters, a choke is recommended for a tighter grouping.

Stratigraphic unit

A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".

Lithostratigraphic units

Sequences of sedimentary and volcanic rocks are subdivided on the basis of their lithology. Going from smaller to larger in scale, the main units recognised are Bed, Member, Formation, Group and Supergroup.

Bed

A bed is a lithologically distinct layer within a member or formation and is the smallest recognisable stratigraphic unit. These are not normally named, but may be in the case of a marker horizon.

Member

A member is a named lithologically distinct part of a formation. Not all formations are subdivided in this way and even where they are recognized, they may only form part of the formation.