Shehecheyanu

The Shehecheyanu blessing (Hebrew: שהחינו‎‎, "Who has given us life") is a common Jewish prayer said to celebrate special occasions. It is said to be thankful for new and unusual experiences. The blessing is recorded in the Talmud (Berachot 54a, Pesakhim 7b, Sukkah 46a, etc.), indicating that it has been recited for over 2000 years.

The blessing of Shehecheyanu is recited in thanks or commemoration of:

Some have the custom of saying it at the ceremony of the Birkat Hachama, which is recited once every 28 years in the month of Nisan/Adar II.

When several reasons apply (such as the beginning of Passover, together with the mitzvot of matzah, marror, etc.), the blessing is only said once.

It is not recited at a circumcision, since that involves pain, nor at the Counting of the Omer, since that is a task which does not give pleasure (and causes sadness at the thought that the actual omer ceremony cannot be performed because of the destruction of the Temple).

בָּרוּךְ אַתָּה יְיָ‎

אֱלֹהֵינוּ מֶלֶךְ הַעוֹלָם‎

Universe,

שֶׁהֶחֱיָנוּ וְקִיְּמָנוּ‎

וְהִגִּיעָנוּ לַזְּמַן הַזֶּה‎׃‎

...
Wikipedia