Processes in Linux

D : This means the process is in uninterruptible sleep mode. Usually Input and output are in this mode.

R : Currently Running Process or is in the running queue.

S :  Is in sleep state waiting for an event to complete.

T :  Means the process is stopped by a signal.
X :  X means a dead process.

Z :  Zombie or dysfunctional process which has terminated.
< : High priority process

N : Low priority process

L : This represents a process which has pages locked into the memory for real time processing or input output.
s : Means that this process is leading the session.

l : Multithreaded process.

+ : Running in the foreground.

Sending Signal to Processes :

Send Continue Signal to a Process :

kill -19 pid