A sekitori (関取) is a sumo wrestler who is ranked in one of the top two professional divisions: makuuchi and juryo.
Currently there are 70 rikishi in these divisions. The benefits of being a sekitori compared to lower ranked wrestlers include:
to receive a salary and bonus (others merely receive an allowance)
to have one's own supporter's club
to wear high quality men's kimono and other items of attire
to have a private room in the training stable
to be able to get married and live away from the training stable
to have junior rikishi to effectively act as their personal servants
to wear a silk mawashi with stiffened cords (called sagari) in tournament bouts
to participate in the ring entrance ceremony and wear kesho-mawashi
to wear the more elaborate oicho chonmage hairstyle on formal occasions
to become an elder in the Sumo Association if one is sekitori for long enough
The name literally translates to having taken the barrier, as only a relatively small fraction of those who enter professional sumo achieve sekitori status.