Question: What  is the number of team  timeouts  that are allowed per period?
About the article "Handball", section "Team officials".

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In American college basketball, there are two systems of timeouts used.
In games that are "not" broadcast, each team is allowed four 75-second and two 30-second timeouts per regulation game.
In games which are broadcast on television, radio, or over the Internet, each team is granted one 60-second timeout and four 30-second timeouts per game in addition to the media timeouts each half.
In the North American National Basketball Association, the rule on timeouts is more complex.
Teams are allowed one 20-second timeout per half, and six regular timeouts, of one minute in length over the course of the entire game.
During a 20-second timeout, only one player may be substituted.
During a regular timeout, there is no limit on substitutions.
In the first and third quarter, there must be two 100-second timeouts.
If neither team has taken a timeout prior to 6:00 of the first or third period, the Official Scorer must take it at the first dead ball and charge it to the home team.
If no subsequent timeouts are taken prior to 3:00, the Official Scorer must take it and charge it to the team not previously charged.
In the second and fourth quarter, there must be three 100-second timeouts.
If neither team has taken a timeout prior to 9:00 of the second or fourth period, a mandatory timeout is called by the Official Scorer and charged to neither team.
If there are no subsequent timeouts taken prior to 6:00, the Official Scorer must take it at the first dead ball and charge it to the home team.
If no subsequent timeouts are taken prior to 3:00, the Official Scorer must take it and charge it to the team not previously charged.
In the fourth quarter, each team is limited to a maximum of three timeouts and if a team has two or three full timeouts remaining when the fourth period reaches the 2:00 mark, one of the timeouts will be changed to a 20-second timeout and it will retain one full timeout.
In overtime periods, each team shall be allowed two 60-second timeouts and one 20-second timeout.
If a team has two full timeouts remaining when the overtime period reaches the 2:00 mark, one of the timeouts will be changed to a 20-second timeout.
The Official Scorer notifies a team when it has been charged with a mandatory timeout.
Additional timeouts in a period, beyond those that are mandatory, are for 60 seconds. 
•Each team gets sixty seconds timeout per half.•Timeouts are signaled by displaying the hands in a “T” figuration.•During timeouts all teams are allowed to use their warm-up area. 
Two timeouts of 30 seconds each are allowed.
If more than the allowed timeouts are called, a penalty is given.
Penalties can range from a single point, to game forfeiture, to a game suspension of the captain. 
In the National Hockey League, between stoppages of play, teams have 18 seconds (five seconds for the visiting team, eight seconds for the home team, five seconds to line up at the faceoff location) to substitute their players, except during TV timeouts.
TV timeouts are two minutes long, and occur three times per period: during normal game stoppages after the 6, 10, and 14 minute marks of the period, unless there is a power play, a goal has just been scored, or the stoppage was as a result of an icing.
Each team may also take one 30 second time-out, but it may only be taken during a normal stoppage of play. 
Each team receives three timeouts per half (if the game goes to overtime, each team receives additional timeouts), making for a total of six timeouts per team in a regulation game.
Timeouts received in the first half may not be used in the second half or overtime.
In professional football, a team must have at least one remaining timeout to challenge an official's call.