RB meaning in Physics Related ?

Answer: What is Rigid Body mean?

In physics, a rigid body (also known as a rigid object) is a solid body in which deformation is zero or so small it can be neglected. The distance between any two given points on a rigid body remains constant in time regardless of external forces or moments exerted on it. A rigid body is usually considered as a continuous distribution of mass.

In the study of special relativity, a perfectly rigid body does not exist; and objects can only be assumed to be rigid if they are not moving near the speed of light. In quantum mechanics, a rigid body is usually thought of as a collection of point masses. For instance, molecules (consisting of the point masses: electrons and nuclei) are often seen as rigid bodies (see classification of molecules as rigid rotors).

reference

Full Form	Category
Research Board	Academic & Science
Rigid Basement	Academic & Science
Revenue Book	Accounts and Finance
Room Booking	Business
Reserve Box	Business
Rubidium	Chemistry
Requires Bind	Community
Rob Berridge	Community
Red Baron (Rittmeister Baron von Richtofen)	Community
Rock Band	Community
Radiocommunications Bureau (ITU-R)	Computer and Networking
Read Binary	Computer Assembly Language
Rotate Buffer	Computer Assembly Language
Reservation Bit	Computer Assembly Language
Rom (read-only Memory) Boot	Computer Hardware
Registry Backup	Computing
Rounded Box	Computing
Resident Bangladeshis	Country Specific
Rechargable Battery	Electronics
Resistance Barrier	Electronics
Rubberized Base	Electronics
Reply By	Email
Richard Bruce	File Type
Round Base	General
Roque Batty	General
Regular Banjo	General
Requires Binding	General
Raised Back	General
Right Bottom	General
Rotatable Back	General
Rocky Blue	General
Red Brown	General
Right Boundary	General
Release Bend	General
The Raging Bears	General
Revolving Back	General
Rice Boy	General
Rugged Blocker	General
Rubber Biscuit	General
Road Board	General
Retinoblastoma By	General
Right Bass	General
Raised Block	General
Rolls Barnoldswick	General
Rock Bakura	General
Rambut Busok	General
Reverse Binoculars	General
Remaining Battery	General
Richard Baggins	General
Roger Benoit	General
Reconnaissance The B	General
Red Bellied	General
Replace Binary	General
Regular Bucket	General
Reverse Bend	General
Rody And Bridget	General
Rody And Bridgitte	General
Red Boy	General
Relative Biomass	General
Round Buckler	General
Raging Bull	General
Rubbish But	General
Running Beast	General
Random Bish	General
Richard Booton	General
Rifle Bomb	General
Reformado Bogota	General
Roberts Brothers	General
The Random Bgp	General
Ruston Bucyrus	General
Rear Bath	General
Rohon Beard	General
Resource Based	General
Resource Bundle	General
Rainbow Bright	General
Rich Burn	General
Replaced By	General
Rose Bowl	General
Random Body	General
Road Bike	General
Right Bend	General
Riverboat	General
Raffel Brothers	General
Running Backs	General
Recommended Beer	General
Rachel Berry	General
Raw Blanks	General
Red Bull	General
Rite Bros	General
Rasen Ball	General
Rochester Beijing	General
Ronald Brooks	General
Royal Blue	General
Rice Bran	General
Ring Bearer	General
Raelert Brothers	General
Red Brick	General
Registered Builder	General
Ruby Base	General
Rogers Batteryless	General
Radek Bonk	General
Roast Beef	General
Red Book	Governmental
Republic of Biafra	Governmental
Rubber Bullet	Governmental
RedBubble	Internet
Right Brain	Medical
RetinoBlastoma	Medical
Random Boner	Messaging
Real Beard	Messaging
Really Big	Messaging
Short-range Coastal Or River Boat	Military and Defence
Std Rubidium Standard	Military and Defence
Review Board	Military and Defence
Remote Backup	Networking
Rigid Body	Physics Related
Room and Board	Real Estate
Radar Beacon	Space Science
Race Bred	Sports
Racing Bred	Sports
Race Breed	Sports
Record Breaking	Sports
Racing Breed	Sports
Right Back	Sports
Record Book	Sports
Running Back	Sports
Rubber Ball	Sports
Record Breaker	Sports
Rich Baller	Sports
Reverse Billing	Telecommunication
Randomized Block	Telecommunication
Resource Bearer	Telecommunication