It is a Bidet Shower.
A bidet shower (bum gun, bidet spray, bidet sprayer, or health faucet), is a hand-held triggered nozzle that is placed near the toilet and delivers a spray of water used for anal cleansing and cleaning of the genitals after using the toilet for defecation and urination. The device is similar to that on a kitchen sink sprayer.
The user typically grasps the faucet in the right hand and uses the thumb or forefinger (depending on the trigger location) to aim a spray of water at the anus or genitals to assist cleansing after using the toilet.
The bidet shower is common in all predominantly Islamic countries and in most parts of Asia where water is considered essential for anal cleansing. This includes Egypt, Nepal, Pakistan (called 'Muslim shower'), China, Iran, India, Maldives, Bangladesh, Turkey, United Arab Emirates, Indonesia, Malaysia, Philippines, Sri Lanka, Thailand, Singapore, Vietnam and Cambodia. In those countries it is commonly installed in Western-style (sitting) toilet installations. In Thailand, it is common in both Western-style toilets and squat toilet installations. The bidet shower is similar in intent, if not method of use, to the Japanese washlet-style toilet seats, or so-called "electronic bidets".
Bidet showers are used by Muslims in Muslim countries and all parts of the Arab world as well as in Asia in order to cleanse themselves with water after using the toilet. Here, water is commonly used instead of, or together with, toilet paper for cleaning after defecation.
In Europe, the bidet shower is used for example in Finland and Estonia. Bidets are more common bathroom fixtures in many southern European countries.
In Turkey this water jet is fixed on the commode and directs water where it needs to go without anyone having to hold a bidet shower and pointing it there.