Scramble seam
a variation employed in seam bowling where the bowler makes the plane of the balls seam tumble, rather than stable at a narrow angle to the direction of the delivery (seam up), or nearly perpendicular to the direction of the delivery (cross-seam). The hope is that the ball will bounce unpredictably depending on whether the balls seam contacts the ground. Seam
1. (noun) the raised stitching running around the circumference of the ball. 2. (verb) for a ball to deviate off the pitch because it has bounced on its seam. Seam bowling
a bowling style which uses the uneven conditions of the ball – specifically the raised seam – to make it deviate upon bouncing off the pitch. Contrast with swing bowling. Seamer
a seam bowler

Season
the period of each year when cricket is played. Varies substantially between countries. Selector
a person who is delegated with the task of choosing players for a cricket team. Typically, the term is used in the context of player selection for national, provincial and other representative teams at the professional levels of the game, where a "panel of selectors" acts under the authority of the relevant national or provincial cricket administrative body. Sent in
a team which bats first after losing the toss is said to have been "sent in" by the opposing captain. Series
A set of matches played a few days apart between the same two teams in the same format, but usually at different locations.
Twelfth man
Traditionally, the first substitute player who fields when a member of the fielding side is injured. In Test matches, twelve players are named to a team prior to the match, with the final reduction to eleven occurring immediately prior to play commencing on the first day. This gives the captain some flexibility in team selection, dependent on the conditions (e.g. a spin bowler may be named to the team, but omitted if the captain feels that the pitch is not suitable for spin bowling). Twenty20 (or T20) 
a form of limited overs cricket in which each team has one innings with a maximum length of twenty overs. Two
batsmans call for a probable two runs, requiring their partner to commit to a fast turn. See No, Push, Yes, Wait. U
Umpire
An official who enforces the laws and adjudicates play. One umpire stands behind the wicket at the non-strikers end, while a second (usually) stands at square leg, with the positions alternating for each over. The two on-field umpires use a system of arm signals to indicate decisions to the players and the scorer. Televised matches usually also have a third umpire to adjudicate on replays and the umpire decision review system. Umpire Decision Review System (UDRS)
(or Decision Review System, DRS)Official system to challenge certain decisions made by an umpire. The third umpire then reviews the decision using various technological aids, such as slow motion television replays, ball tracking, a snickometer etc.