Ja

Jack
Mechanical or hydraulic device for lifting heavy equipment off the floor.
Jack Rafter
A shortened rafter that joins a hip or valley to the top of a wall plate.
Jack Shaft
A shaft used as a spacer between two points.
Jackbolt
A bolt or screw attached to the baseplate or foundation that is used to move or position the machine that is being moved.
Jackscrew
A bolt or screw attached to the baseplate or foundation that is used to move or position the machine that is being moved.
Japanese Industrial Standards
Body that produces standards, often abbreviated as JIS.
Japanese Standards Association
Body that produces standards.
Jarno
A standard taper having 0.600 inch taper per foot used on some machine tools.
JASA
Abbreviation of Journal of the Acoustical Society of America.
JATO
Utilising solid or liquid fuel rockets to augment the take-off power of an aircraft′s engines.
Java
Object oriented language designed to work on all platforms.
JavaScript
An object-oriented scripting language used to enable programmatic access to objects within both the client application and other applications.