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P̃ (majuscule: P̃, minuscule: p̃) is a Latin P with a diacritical tilde. It is or was used as a grapheme in some languages of Vanuatu, such as North Efate, South Efate and Namakura, to represent a [k͡p].
The letter was introduced by missionaries and has been in use for over a hundred years.
Computer encoding 
Unicode encodes p with tilde with a combining diacritical mark (U+0303 COMBINING TILDE), rather than a precomposed character. As such, the tilde may not align properly with some fonts and systems. In standard HTML code: majuscule P̃, minuscule p̃. The Unicode HTML hex code is: minuscule p̃, majuscule P̃. The Unicode HTML decimal code is: minuscule p̃, majuscule P̃.
See also 
Letter P with diacritics
Letters using tilde sign ( ◌̃ )