Mahpach (Hebrew מַהְפַּ֤ך, with variant English spellings) is a common cantillation mark found in the Torah, Haftarah, and other books of the Hebrew Bible. It is part of the Katan group, and it frequently begins the group. The symbol for the Mahpach is <.
Mahpach is always followed by a Pashta. This is because Mahpach is a conjunctive, showing a connection with the word that follows. When the Mahpach is found, the < is placed under the syllable that is most heavily stressed. The variant Yetiv trope uses the same < symbol as the Mahpach, but does not have a Pashta that follows.
The Hebrew word מַהְפַּ֤ך translates into English to reversal. The original symbol looked more like a sideways U than a V (to represent going forward then turning back around), but this got changed because it was easier for printers to print, as modern keyboards have the < symbols.