What does RM stand for?

Rook Master

Random Master

Rude Master

Rage Master

Rage Master ROFL!

im so confused

Is visualizing the moves related to tactics? If so how? can anyone help me?

There´s also the SGM - Grandmasters that reached 2700+, though not an official title...

What is an RM, LM, and SM?

My friend Michael Lim, age 13, has a rating of 2100. One year ago, with a rating of 2050, he achieved the Candidate Master title. The 2200 rating for Candidate Master is usual, but not not completely necessary. Michael earned this title by winning the national U12 tournamanent. By doing so, he earned the Candidate Master title, as well as qualified for the Pan American. He was also chosen as the representative for age 12. Hah hah. He earned the right to go twice!!

LM = life master  (as in you've maintained a master rating for a long period)
SM = senior master  (as in better, not older heh)

I've actually never heard of RM that I'm aware of... interesting.

RM=Ruy Lopez Master :-)

I'm still waiting for the day they decide to create a NE (national expert) title. Maybe soon (doubt it)

And I believe there are 2 different CM titles-USCf awarded with 2000 rating and 5 norms, and FIDE rated with 2200 rating and no norms.