What are the meaning of these terms with respect to dislocation?

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Ebenezer Jacob Dhas D.S.

By placing the thumb of the left (or right) hand in the direction of the screw, the dislocation could be checked. Check the following link: https://www.tf.uni-kiel.de/matwis/amat/iss/kap_5/illustr/s5_4_1a.html#!Burgers

Omar M S

I recommend the answer from Ebenezer

for more information I suggest to read the book “Solid State Physics” by S O Pillai

Dr Azeez Barzinjy

I guess this website will answer your questions easily:

http://www.globalsino.com/EM/page3458.html