This character is a Other Symbol and is mainly used in the Katakana script.
The glyph is a square composition of the glyphs Katakana Letter Pe, Katakana Letter So. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. This katakana joins with other adjacent katakana to form a word. U+3337 offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
The peso is the monetary unit of several Spanish-speaking countries in Latin America, as well as the Philippines. Originating in the Spanish Empire, the word peso translates to "weight". In most countries of the Americas, the symbol commonly known as dollar sign, "$", was originally used as an abbreviation of "pesos" and later adopted by the dollar. The dollar itself actually originated from the peso or Spanish dollar in the late 18th century. The sign "₱" is used in the Philippines.
The silver peso worth eight reales was also known in English as a Spanish dollar or "piece of eight" and was widely used for international trade from the 16th to the 19th century.