Compass-And-Straightedge Construction refers to a classical method of geometric construction using only a compass and a straightedge. This skill involves creating geometric figures and solving problems by drawing lines and circles based on specific rules and principles. Knowledge of Compass-And-Straightedge Construction is used to derive various geometric properties, construct angles, and create shapes, thereby enhancing understanding of fundamental geometric concepts and relationships.

Jig Borer refers to a precision machining process that involves the use of a jig borer machine to create accurate holes and features in workpieces. This skill encompasses the ability to set up and operate the machine, ensuring precise alignment and measurement for intricate components. Knowledge of Jig Borer is utilized in manufacturing and engineering to achieve high levels of accuracy in the production of parts that require tight tolerances and complex geometries. The skill is essential for tasks such as tooling, fixture design, and the fabrication of components in various industries.

Machining Technology refers to the processes and techniques used to shape and fabricate materials, primarily metals, through the removal of material. This skill encompasses knowledge of various machining methods, such as turning, milling, and grinding, as well as the operation of machine tools and equipment. Understanding Machining Technology is utilized to produce precise components and parts for a wide range of applications in manufacturing, engineering, and construction by ensuring accuracy, efficiency, and quality in production processes.

Tool Steel refers to a variety of carbon and alloy steels that are specifically designed for making tools and dies. It is characterized by its hardness, resistance to abrasion, and ability to retain a cutting edge at high temperatures. Tool steel is used in manufacturing processes such as cutting, pressing, extruding, and coining metals and other materials. It is also applied in the production of machine parts and components that require high durability.

Trigonometry refers to the branch of mathematics that studies the relationships between the angles and sides of triangles, particularly right-angled triangles. This skill encompasses the understanding of trigonometric functions, such as sine, cosine, and tangent, which are used to calculate unknown angles and distances. Knowledge of Trigonometry is applied in various fields, including physics, engineering, and architecture, to solve problems involving periodic phenomena, wave functions, and structural design.