The Sof passuk (Hebrew: סוֹף פָּסוּק, end of verse, also spelled Sof pasuq and other variant English spellings, and sometimes called סלוק silluq) is the cantillation mark that occurs on the last word of every verse in the Tanakh. Some short verses contain only members of the sof passuk group.
The Sof passuk can be preceded by the marks Mercha, Tipcha, and Mercha in that order, including either all or some of these. However, these Merchas and Tipchas do not have the same melody as those in the Etnachta group. Altogether, there are five possible arrangements how these can appear.
There is controversy over the use of the Sof Passuk during the reading of the Ten Commandments. There are two versions of the trope sounds for the Ten Commandments, one that divides them into 13 verses, based on the number of Sof Passuk notes, and the other that divides them into ten verses, the actual number of commandments. It is for this reason that not all commandments actually have a sof passuk at the end of their own names.
The end of a single reading (aliya) is marked by a Sof Parasha (סוף פרשה), which is chanted in a different melody, thereby giving the sound of finality to the reading. The Sof parasha can be applied to different verses based on different reading schedules, including the full parsha (on Shabbat during Shacharit in most synagogues), a partial reading (as is read on weekdays, Shabbat Mincha, and the selected readings of various holidays), or the Triennial cycle.
At the conclusion to any sefer of the Torah, a special tune is used in order to incorporate the words "Hazak Hazak Venithazek" which after the final word are recited first by the congregation and then repeated by the reader.