Tehillat Hashem (תְּהִלַּת ה', "praise of God" in Hebrew) is the name of a prayer-book (known as a siddur in Hebrew) used for Jewish services in synagogues and privately by Hasidic Jews, specifically in the Chabad-Lubavitch community.
(except for the edition that was printed in Rostov) Because the basis of the Siddur is taken from the Seder HaAvodah, most of the names of hashem in it are formed of two letter Yud's.
Later in 1945 an enlarged, completed edition of this siddur was published by the Merkos L'Inyonei Chinuch in Brooklyn, New York for the use of Jewish school students.
The siddur also features extracts from the Shulchan Aruch HaRav relevant to certain rituals.
Other glosses, 47 in number (they may be identical to the previous ones) were made in preparation for the 1966 edition, so the arrangement was printed in both regular and pocket format.