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A barrier is a physical structure which blocks or impedes movement. The barrier tag only covers on-the-ground barriers. It does not cover typical waterway barriers (dams, waterfalls, etc.). However, barriers that are normally found on land (such as fences) can also be found (and thus tagged) in water.

Barrier methods of birth control act as barriers to keep sperm from reaching the egg. Some barrier methods also protect against sexually transmitted infections (STIs). A few barrier methods (spermicide, condom, and sponge) can be bought in most drugstores. Others (diaphragm and cervical cap) must be prescribed by a health care professional.

Barrier methods are not as effective at preventing pregnancy as other birth control methods, such as the birth control implant, injection, or intrauterine device (IUD). Out of 100 women per year, 18 to 28 women will become pregnant when using barrier methods. (Read Effectiveness of Birth Control Methods.)

Barrier methods work best when they are used correctly every time you have sex. Even one act of sex without using a barrier method can result in pregnancy. If your barrier method breaks or becomes dislodged during sex, or if you forget or are unable to use it, you may want to consider emergency contraception (EC). (Read Emergency Contraception.)

Spermicide is a chemical that inactivates sperm. Most spermicides in the United States contain a chemical called nonoxynol-9. Spermicide can be used alone or with all other barrier methods except the sponge, which already contains a spermicide.

The cervical cap is a small plastic dome that fits tightly over the cervix and stays in place by suction. It acts as a barrier to keep sperm from entering the uterus. It should be used with a spermicide. A health care professional must fit and prescribe the cap. The type available in the United States comes in three sizes.

The class template std::barrier provides a thread-coordination mechanism that blocks a group of threads of known size until all threads in that group have reached the barrier. Unlike std::latch, barriers are reusable: once a group of arriving threads are unblocked, the barrier can be reused. Unlike std::latch, barriers execute a possibly empty callable before unblocking threads.

A barrier object's lifetime consists of one or more phases. Each phase defines a phase synchronization point where waiting threads block. Threads can arrive at the barrier, but defer waiting on the phase synchronization point by calling arrive. Such threads can later block on the phase synchronization point by calling wait.

Barrier islands are coastal landforms and a type of dune system that are exceptionally flat or lumpy areas of sand that form by wave and tidal action parallel to the mainland coast. They usually occur in chains, consisting of anything from a few islands to more than a dozen. They are subject to change during storms and other action, but absorb energy and protect the coastlines and create areas of protected waters where wetlands may flourish. A barrier chain may extend uninterrupted for over a hundred kilometers, excepting the tidal inlets that separate the islands, the longest and widest being Padre Island of Texas, United States.[1] Sometimes an important inlet may close permanently, transforming an island into a peninsula, thus creating a barrier peninsula,[2] often including a beach, barrier beach.The length and width of barriers and overall morphology of barrier coasts are related to parameters including tidal range, wave energy, sediment supply, sea-level trends, and basement controls.[3] The amount of vegetation on the barrier has a large impact on the height and evolution of the island.[4]

Chains of barrier islands can be found along approximately 13-15% of the world's coastlines.[5] They display different settings, suggesting that they can form and be maintained in a variety of environments. Numerous theories have been given to explain their formation.

A human-made offshore


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